Reverse Osmosis Water Filter System (4002533638226)

Waterdrop Refurbished G3 RO System

Regular price €603,79
Sale price €603,79 Regular price

Guaranteed Safe Checkout

Klarna Payment Badge
  • Key Feature
Free Shipping ×
Shipping policy

Shipping rates and delivery estimates

Shipping Method

Estimated Delivery Time


Economy Shipping

4-10 Business Days


Standard Shipping

3-6 Business Days

$5.99(Free on order over $200)

Express Shipping

2-5 Business Days


* Shipping charges for your order will be calculated and displayed at checkout.

* The Delivery Time is calculated based on the shipping date, not the order date. The actual shipping date can be delayed due to invalid shipping address, weekends/holidays, etc.

Handling Time:

We need 24h to 48h to prepare your order, most of the packages will be shipped out within 24 hours except weekends and holidays.

Track your order

Once your order is shipped, you will receive an email from us containing the tracking information. Tracking information is also available in your "Order Details" page.

Shipping areas

The products can be delivered to the most of states in United States except American Samoa, Micronesia, Guam, Marshall Islands, Northern Mariana Islands, Palau, Puerto Rico and U.S. Virgin Islands.

International shipping

We are sorry that the international shipping service is not supported for the time being.

Shipping Carriers

We work with 4 carriers to make sure your order will arrive on time: UPS, USPS, FedEx and Amazon Logistics US.

Delivery Time Exceeded

Shipping might experience delay due to covid-19. If your order is delayed, please contact us via email, we will check the situation with the transportation company in time. Thanks for your understanding and support.

Note: We don't accept requests to specify a certain carrier to deliver the package.

Shipping origin

The package will be shipped from one of our US warehouses closest to your location.

* If you have any questions, you can contact our customer via LiveChat or email to, we will reply to you as soon as possible!

Sales Tax

The sales tax will be collected in accordance with U.S. tax laws. Customers whose delivery address within the following states will be charged a certain tax at checkout, and the tax rate is determined by the local government. (AZ, CA, CO, FL, GA, IL, IN, KY, MA, MD, MI, MN, NC, NJ, NV, NY, OH, PA, TX, UT, VA, WA, WI) All taxes collected will be reported and filed to the IRS on time.

30-Day Return ×
No Worries Guarantee

Thank you for shopping at Waterdrop. We appreciate your decision to purchase our products and aim to ensure a rewarding experience throughout your exploration, evaluation, and purchase process.

Order Cancellations:

If you wish to cancel an order, please contact our customer service team.

1. If you contact us within 24 hours of purchase:

Since most orders ship the same day, kindly email us at contact or call us at (888)-352-3558 within 24 hours of placing the order. There will be no cancellation fees for standard items canceled before shipment. If the package has already been shipped, we will provide a prepaid label for return, and once we receive the package from you, we will issue a refund.

2. If you contact us after 24 hours of purchase:

  • In such cases, you will need to bear the shipping fee if the package is already shipped (subject to our system status, not the order status).
  • The product must be damage-free, packed in the original packaging we sent to you, and returned with the original receipt of purchase.
  • We will process your refund after receiving the package.

30-day Risk-free Return Policy:

  • You are eligible to return any item* within 30 days of receipt.
  • All returned items must be disassembled and repackaged as they were originally received.
  • The 30-day risk-free return policy applies to all item*.
  • No restocking fee will be charged, but customers are responsible for the return shipping cost. We will cover the return postage expenses in the case of any return requests related to a quality issue.
  • Please note that the 30-day risk-free return policy is only valid for orders* within the continental United States.

Return after 30 Days of Receipt:

  • You may still return any item after 30 days of receipt.
  • In this case, customers are responsible for the return shipping cost. The total cost of shipping will be deducted from your refund.
  • All returned items must be disassembled and repackaged as they were originally received.
  • A 10% restocking fee will be applied to all returned products. However, in the event of any return requests related to a quality issue, we offer free returns or replacement with a new product.

1-year Warranty:

Enjoy peace of mind and confidence in your purchase with our 1-year warranty, backed by lifetime technical support.

If you receive a damaged item and wish to file a claim, please email with your order information and a picture of the damaged or incorrect product. We are eager to assist you.

For products that become defective during the warranty period due to a quality issue, rather than your own breakage or misuse, we can accept a free return, provide free repair service, or issue a new replacement.

Exchange Policy:

1. Defective Products:

If you receive a product with quality issues or damages, please contact our customer service team within 30 days of receipt. We will provide you with a free exchange service. Please provide order information and photos of the damaged product when contacting our customer service team for better assistance.

2. Non-Quality Issues:

If you wish to exchange a product for non-quality-related reasons, please note the following:

  • The product must be within 30 days of purchase and unused.
  • The product must be returned in its original packaging, along with the original purchase receipt.
  • You will be responsible for the re-shipping costs.
  • Please note that the exchange policy is only applicable to orders made on the official

How to Return a Product?

If you would like to return a product, please follow these guidelines:

Step 1: Contact our customer service team before returning a product. We will respond with return instructions within 24 hours.

How to contact us:


Toll-free Tel: (888)-352-3558

Step 2: Prepare the package after receiving confirmation from the customer service team, and please note the following requirements:

  • Include the order number in the package. You can print out the order detail page or leave a note inside the package.
  • Ensure the package contains the original receipt of purchase.
  • Return the product in the original packaging we provided.
  • The product must be damage-free (this does not apply to defective products, as damage will void the refund).

Step 3: Contact our customer service and provide your return tracking number. We will track the package and process your refund within 5 working days after receiving and inspecting the package.

General Information for All Returns:

1. Defective Products:

If you receive a product with quality issues or damages, please contact our customer service team. we provide free returns, replacement with a new product, and comprehensive technical support.

2. Non-Quality Issues:

  • You are responsible for shipping the products to the return address provided.
  • Returned items will undergo inspection before issuing a refund.
  • Refunds will be processed within 5 working days after the item has been inspected, and it may take 4-7 days to be reflected in your credit card statement.
  • We highly recommend using a traceable and insurable shipping method for your return. We are not responsible for returns lost or damaged in transit, and you will need to file a shipping claim.
  • Please note that orders made via 3rd-party sellers, including Amazon, are not eligible for our return policy.
  • All returned items must be disassembled and repackaged as they were originally received. Items returned in a condition other than "like new" will be subject to a 10% restocking fee to cover repairs or part replacement. The restocking fee will be deducted from your refund.

Return Address:

Ecolife Technologies, Inc.

1951 S Lynx Pl,

Ontario, CA 91761

United States

Tel: 888-352-3558

Price Match Policy:

At Waterdrop, we highly value our customers' shopping experience. That's why we offer a 30-day price match guarantee. If you happen to notice a price reduction on the item you purchased at within 30 days of your purchase, you are eligible to claim a price-match refund. To request a refund, please contact us at We are here to assist you promptly.

Note: This Waterdrop price-change refund policy only applies to items shipped and sold by If you're buying from a different vendor, you'll need to contact that seller if the price drops.

Copy successfully!

Waterdrop Refurbished G3 RO System

Regular price €603,79
Sale price €603,79 Regular price
Model number
 NSF 58 & 372
System cover: BPA-free plastic
Faucet: metal + LED indicator light
RO filter: reverse osmosis membrane
CB filter: carbon block
CF filter: PP cotton & carbon block
Power cord length
90 inches
Product dimensions
18.11 x 5.67 x 17.73 inches
Item weight
15.44 pounds
Brushed nickel faucet
Remineral RO Faucet
Brushed nickel
Included components
 System cover, brushed nickel faucet faucet, RO filter, CF filter, CB filter, PE pipes *3 ( 60" ), T-fitting, drain saddle, lock clips, power adapter (Main power cable 90", faucet's power cable 59") 
Flow rate
0.28 gallon per minute (GPM), 400 gallons per day (GPD) 
Indoor or outdoor use
Indoor use only
Wall plug
Usage conditions
Ice machines, Faucets, Aquariums, RVs
An electrical outlet is required to operate the RO system.
Reduction substances
TDS, chlorine, taste and odor
Harmful substances: chromium (hexavalent), chromium, ferric oxide
Heavy metals: lead, mercury, barium, copper, radium 226/228, aluminum
Microorganic harmful substances
Inorganic harmful substances: arsenic and inorganic arsenic compounds, fluoride
Organic harmful substances

Why choose a reverse osmosis water filter system for home?

Waterdrop G3 Reverse Osmosis Water Filtration System, one of the latest home water filter system launched last year, is an ungraded water filter system dedicated to meet your urgent need for the highest harmful substances reduction rate with a fast water flow. RO, the abbreviation of reverse osmosis, is a “superstar” technology employed in water purification system, where partially permeable membrane is used. And we are striving for excellence to deliver the right water purifier for you. We have a series of drinking water filtration system, and Waterdrop G3 RO system is a tankless under sink RO system. Let me tell you why choosing Waterdrop reverse osmosis drinking water filter system is one of the best decisions you will make!
For decades, we drink water directly from the faucet with no awareness of the fact that some substances in taping water are harmful to our health. Lead, for a start, is a toxic metal that comes from the pipe lines in almost every American household. Drinking lead-tainted water can lead to many problems. Once absorbed, lead will be stored in our bones as a continual internal exposure, waiting to be released as our bones demineralize. This may result in people getting possible health risks like high blood pressure, cardiovascular diseases. Children under age 3 is extremely vulnerable to it. Luckily, our RO water purifier is NSF 372 certified for lead-free material, effectively cutting off lead exposure from root. The system also got NSF 58 claim to reduce 91.9% of TDS, another main impurity we aim to conquer. TDS, standing for total dissolved solid, effects taste and odor of water if its level is exceedingly high. Removing TDS can give you a pure water free from unpleasant taste and odor. Waterdrop G3 Reverse Osmosis desalination is above 90%. This is the reverse osmosis system you can ever have!
Besides all the certifications,  Waterdrop reverse osmosis filtration system uses composite RO water filter. This original move brings about excellent performance in filtration. Its seven-stage filtration of the home reverse osmosis water filtration system is achieved by combining multiple under sink water filter materials into one reverse osmosis water filter.

How does a reverse osmosis water filter system work

Water first goes through a pre-sediment PP membrane and a carbon block filter. The high-precision activated carbon block is made from coconut shell, the pore of the activated carbon block in which is much higher than that in other forms. This will reduce sands, rusts, chlorine, etc. After running through another sediment membrane for additional impurities rejection, water will face a multi-stage composite filter design with reverse osmosis system—reverse osmosis membrane, to reduce 91.9% of TDS and heavy metals like arsenic and mercury. The efficiency equals more than three stages of filtration. Using RO membrane will give you an extra benefit—you don’t have to replace filters that frequently! The reverse osmosis filter can bring you so much convenience! With the last step of filtration through a secondary activated carbon block finished—mission accomplished! Any particles larger than 0.0001 μm will be filtered out.  it reduces most of the harmful substances and includes TDS reduction. There, a cup of water that is pure, healthy, absent of taste, odor and color is right in front of you.
This is what we give you—the reverse osmosis water. Get you a water filtration system for home because this is the home water filter using the RO filter!
Waterdrop G3 RO water filtration system is an all-in-one, intelligent water purification system with many innovative designs. Our under sink reverse osmosis is designed to be a tankless RO system, leaving out the gigantic and ugly reverse osmosis water tanks used often in conventional water treatment systems. And this smaller and more compact reverse osmosis system can be easily put under the sink while saving more storage than its conventional counterparts. This is the water filter systems for home! The tankless reverse osmosis water filter system review is high on the home water filtration system list. Another innovative design is the internal pump, which is used for raising water pressure, and with the application of composite filter elements, the water flow of the under-sink water filter can reach to 400 GPD (gallons per day). This literally means you can get a cup of filtered water in just 12 seconds. The traditional RO system, however, filters water more slowly and stores water in the reverse osmosis tank, and therefore cannot meet the goal of producing purified water. This quick water purification process and tankless design meet the need of your whole family and even small companies for a purer RO water.
Besides this, Waterdrop G3 RO Filtration System is environmentally friendly, as it saves water waste by 300% compared with traditional home water filtration system. The waste water ratio is 1:1. There are complaints about reverse osmosis water system filtering more waste water than filtered water, but with our product, we free you from this worry. And waste water is by no mean a waste. Instead, you can use your innovation to use this water to flop floor, clean yard, or even wash car. Of course, this will also save you money on water bills. It kills two birds with one stone! Another advantage of buying our RO water system is its simple installation. It’s normal to look at countless components, having no clues about how to put them together to become one machine, let alone an enormous pure water filter such as this. But please don’t worry about that. Our filtered water dispenser is designed to be easy-to-install. Within just a few minutes, an under-sink water filtration system can be installed and put to use. But make sure that once the installation is finished, the first step is to turn on the faucet and flush the system for about half an hour. The light on the faucet will flash blue during this period time. Wait till it stops, and then you can start to use the system and enjoy the excellent water filtration. Water filter replacement is another advantage. Reverse osmosis filter replacement is also quite simple, as it can be changed with one single turn.
All in all, Waterdrop promises to give you the right home water filter system possible, so that you and your family members can enjoy the great-tasting, pure, and healthy water. We regard having healthy drinking water as one of the most important human rights, and customers need is paramount, and we value your reverse osmosis system reviews as these are what makes us see where our problems lie and ways to help us progress! We are here to deliver the right water filtration system!

Are these refurbished RO systems reliable?

Yes, we only sell machines that have undergone rigorous quality and sanitation checks, and repackaging processes to ensure they function as new. Additionally, all filter elements have been replaced with new ones, giving you the peace of mind to use them with confidence.

Will I receive a warranty with my refurbished G3 RO system?

Yes, we provide a 1-year warranty with each refurbished RO system that we sell, giving customers peace of mind and protection against any unforeseen issues.

How do I ensure that my refurbished RO system works optimally?

We recommend regular maintenance and cleaning of your used or refurbished RO machine to ensure optimal performance. We also provide support and guidance on maintaining your machine, including filter changes and routine checks.

Will I need to replace the filter elements on a pre-owned RO system?

No, you will not need to replace the filter elements as all filter elements have already been replaced with new ones during our thorough cleaning and servicing process. You can use the RO system with confidence, knowing that it has been refurbished to meet our high standards and is ready for use. If you have any further questions or concerns, our team is always available to provide support and guidance.

What is the difference between Waterdrop and traditional RO systems?

Waterdrop RO system Traditional RO system
Tankless design
Flow rate 400GPD 50GPD
Smart leakage protector
3s filter change time
Drain ratio 1 : 1 1 : 3
Real-time Water Quality Display

What is reverse osmosis water systems?

Reverse osmosis (RO) is a water purification process that uses a partially permeable membrane to filter out impurities from drinking water. In reverse osmosis, an applied pressure is used to overcome osmotic pressure, a colligative property that is driven by chemical potential differences of the solvent, a thermodynamic parameter. The result is that the solute is retained on the pressurized side of the membrane and the pure water is allowed to pass to the other side. To be "selective", this membrane should not allow large molecules or ions through the pores, but should allow filtered clean water to pass freely.

How does a reverse osmosis system work?

A reverse osmosis system reduces sediment and chlorine from water with a prefilter before it forces water through a semipermeable membrane to reduce dissolved solids. After water exits the RO membrane, it passes through a postfilter to filter the drinking water before it enters a faucet.

Does the reverse osmosis water filtration system produce wastewater?

All RO systems will produce concentrated water to discharge impurities. Compared to traditional RO water purifiers, Waterdrop RO system produces less concentrated water and saves 300% more water. You can collect concentrated water to mop the floor, wash your car, do laundry, etc.

What harmful substances can Waterdrop reverse osmosis water filter system remove?

Waterdrop reverse osmosis water filter system adopts advanced composite filter technology. Uses the characteristics of various filter materials skillfully and combines them to achieve better filtration. The composite filter can intercept most harmful substances.
• TDS, chlorine, taste and odor.
• Harmful substances: chromium (hexavalent), chromium, ferric oxide.
• Heavy metals: lead, mercury, barium, copper, radium 226/228, aluminum.
• Microorganic harmful substances
• Inorganic harmful substances: arsenic and inorganic arsenic compounds, fluoride.
• Organic harmful substances

Does Waterdrop reverse osmosis water filter system need power?

The RO system has a pump that will need power to maintain a fast water flow rate.

How to install reverse osmosis system?

Waterdrop RO systems are designed for DIY installation. You can install the system in 30 minutes. Simply refer to the instruction manual and instructional videos, or contact us by email, phone, or live chat.
This video explains how to install Waterdrop RO system.

How often do I need to change the RO filter?

G3: The CF filter has a 6-month lifetime; the CB filter has a 1-year lifetime; the RO filter has a 2-year lifetime. Waterdrop G3 Reverse Osmosis System has a smart faucet and filter life indicators that will remind you to replace the filter.

Does the reverse osmosis system make a loud sound?

The sound will not exceed 65 dB, which is a comfortable level for everyday life (65 dB is tested under standard laboratory conditions, where the feed water pressure is between 14.5 psi and 87 psi). A loud sound may be caused by the following:
a. The system is not positioned in a flat area. Make sure the system is placed smoothly without shaking.
b. The system is placed against the cabinet. Do not place the system against the cabinet. The system may vibrate when it works.
c. The water pressure is unstable. Check and confirm the water pressure is between 14.5 psi and 87 psi. The sound will decrease when the water pressure becomes stable.

When you change filters, do you need to turn the water off?

The water source and power supply are not required to be cut off when the filters need to be replaced. The replacements can be directly screwed and reinstalled. RO system can be normally used after resetting and the flushing process are finished.

Does the RO system remove coliform and other parasites?

Our RO system uses reverse osmosis filtration technology with a filtration accuracy of 0.0001um, and the system can effectively reduce most harmful substances, including coliform and other parasites.

Does this RO water system remove arsenic?

As a benefit of the RO membrane (filtration accuracy: 0.0001μm), this product is able to reduce the arsenic efficiently from the source water. The membrane has microscopic pores that are specially sized to allow water molecules through, while trapping larger inorganic molecules like lead, iron, chromium and arsenic.

Is this reverse osmosis water filter system unit suitable for well water?

We do not recommend using well water as source for our RO systems.
The reasons are as follows:
1. Large particles.
Compared to municipal tap water, the well water is rich of large particles, which will clog the filters easily, and shorten their lifetime significantly.Please note that the filters will still need to be replaced more frequently, even if you have added a pre-filtration system.
2. Composition
The well water has very complicated compostion, and some of them (apart from the large particles) can cause the filter or internal valve to be clogged and prevent the RO system from normal performance.
3. Water pressure
The well water may not provide the feed water pressure that the RO system requires (14.5 psi min.). Furthermore, the water pressure will be even lower after passing through pre-filtration systems.

Do you need to have an electrical outlet under your sink for this work?

As a standard appliance, this product will need to be plugged into one electrical outlet to function normally.

Does this RO system need a drain piping nearby for discharge?

Yes, this model does need a drainpipe nearby, for discharging the waste water. For that, we provide an adjustable drain saddle to connect the RO's waste water tubing to your drainpipe.

What is the amount of space required between the RO unit and the cabinet?

In order to avoid the vibration which can affect the use experience, please ensure that there is an about 1-inch gap between the RO system and the cabinet. The size of the RO Filtration system is 18.11 "* 5.67" * 17.72 ", without a storage tank. It's very thin and takes up very little space.

Has this RO water system been NSF certified yet?

Yes, our RO system has been tested and certified by NSF International. Here is the link for your reference.

Is the water line hose 1/4" or 3/8"?

Inlet tubing: 3/8", Outlet tubing (connect with RO faucet): 1/4", Feed water adapter: compatible with 3/8" and 1/2" water line.

Can I buy the accessory kit so that I can hook up my fridge all at once?

Yes, the instruction manual explains how to connect the Waterdrop to your fridge using parts purchased from a hardware store. The output from the Waterdrop to the faucet is 1/4” tubing. If your fridge has a 1/4” input, all you need is a 1/4” quick-connect T-adapter and the tubing that you’ll run to your refrigerator - you can find these online or at your local hardware store. If your refrigerator is like mine, the input is 3/8”, so I had to add an additional 1/4” to 3/8” adapter to the line leading from the T-adapter to the fridge. It doesn’t affect the performance of the Waterdrop at all.

Is this reverse osmosis water system BPA free?

Please note that our RO system is BPA free.

Does this reduce or remove the salt in the water from my water softener?

Although with filtration accuracy of 0.0001 μm, this model can reduce Calcium ion 90% of the salt from the water, the remaining salt added by the water softener may still affect the water taste. Therefore, we don't recommend placing the RO system after a salt-based water softener, since the taste will be affected.

What is the minimum water pressure to operate this unit?

The rated water inlet pressure of the machine is 14.5-87psi. It can work properly within this range.

What size hole would I need to drill to install the faucet in my sink?

It's recommended to drill a hole of 1". If there's a reserved hole for the soap dispenser on your countertop, you could use that to install the RO faucet directly. In addition, we have included a sticker in the package, which could be used as a reference while drilling the hole.

How often do you need to replace the reverse osmosis filters?

The life of the filter element of our machine depends on the two indexes of service time and pure water after filtration. As long as one of them reaches the upper limit, it needs to be replaced. The first stage front compound filter element is recommended to last for 6 months or to filter 550 gallons of pure water. The second stage RO element is recommended to last 24 months or to filter 2200 gallons of pure water. The third stage rear carbon rod filter is recommended to last 12 months or to filter 1,100 gallons of pure water. Due to the different water quality and water consumption of each house, the actual replacement time of the filter element is not consistent. The actual use situation shall prevail. When the filter element needs to be replaced, the prompt light on the machine and the lamp ring of the faucet will prompt through the color change. You can replace it according to the prompt, which is very convenient.

Can the system be connected with a UV water sterilizer?

Yes, it can be connected with a UV water sterilizer, and it requires an extra power plug (the UV water sterilizer requires extra power).

How often do you have to change the membrane?

The RO membrane filter needs to be changed every 24 months or 2200 gallons.

Can the system be connected to the refrigerator so the ice is filter as well?

Generally speaking, the RO system can be connected to your refrigerator. After completing the registration online, you could choose the accessory kit, which will help you connect the RO to your refrigerator/ice maker. Since different refrigerator/ice maker has various requirement of water pressure, it's not possible for our RO system to provide them all. Connection under mismatched circumstance may result in many problems, including but not limited to: slow ice making, frequent start-stop issue, etc. Therefore, it's NOT recommended to connect the RO system to your refrigerator/ice maker.

Does this reverse osmosis water system prevent harmful substances from growing in the filter?

Please rest assured that the RO membrane (filtration accuracy 0.0001 μm) can effectively reduce impurities whose diameter is greater than 0.0001 μm from the source water.

What is the waste water to filtered water ratio?

The waste to filtered water ratio is 1:1, which is much higher than the traditional RO systems.

Can I use our own faucet?

Truly sorry, the brushed nickel faucet is the only option available now.
You could use your own RO faucet with our product, but not normal faucet for tap water.
There are a few things you may need to know before purchasing one:
Firstly, our faucet is equipped with a filter life indicator, which allows you to monitor the filters' life easily. If you decide not to use our original faucet, this function will not be in effect.
Secondly, your RO faucet should be able to connect with the outlet tubing of the system, which has a diameter of 1/4".
In addition, it should have a "Quick-Connect Fitting", please click here.
OR, it should come with a set of accessory parts, which allows you to connect the faucet with the bare end of our outlet tubing. Please click here to see the example for your reference.
If the faucet does not meet one of these requirements, you will need to acquire a corresponding adapter, in order to complete the connection with the machine.

What does Pure to Drain Rate mean?

The reverse osmosis water filter relies on a semi-permeable membrane to filter out impurities from drinking water. When the tap water is compressed through the RO membrane, it produced pure water and waste water. The ratio of pure water to waste water is called wastewater ratio. 1:1 wastewater ratio means 1 gallon water is wasted per 1 gallon purified, and 2:1 wastewater ratio means 1 gallon water is wasted per 2 gallon purified. The higher the wastewater ratio is, the less waster water produced during the filtration process. During the use of RO water filter, the actual ratio might be lower than the labeled, depending on many factors such as water quality, pH, pressure and temperature.
At Waterdrop, we know that access to clean and safe drinking water is essential for everyone's health and well-being. That's why we are committed to providing you with affordable and dependable options for your water filtration needs.
Why Opt for the Refurbished G3 RO System?
Waterdrop refurbished G3 RO system is priced significantly lower than new ones. You can save up to 40% or more by purchasing a refurbished RO system from us.
High-quality Standards
We have taken great care in inspecting and sanitizing each machine to ensure they meet our high-quality standards. You can rest assured that every machine has been repackaged to look and perform like new.
Environmentally Friendly
By purchasing a refurbished RO system, you are contributing to a more sustainable future by reducing waste and minimizing the impact on the environment.
Fully Functional
Our pre-owned RO systems are not only fully functional, but they also have the same high-performance capabilities as a new system. You can trust that you are purchasing a reliable product that has been inspected, cleaned, and serviced to meet our rigorous standards. Additionally, all filter elements have been replaced with new ones, giving you the peace of mind to use them with confidence.
1-year Warranty
We provide a 1-year warranty with each refurbished G3 RO system that we sell, giving customers peace of mind and protection against any unforeseen issues.
Waterdrop is committed to providing our customers with exceptional value for their money. Our refurbished RO systems are no exception, and we stand behind their quality with our rigorous inspection and sanitation processes. You can trust that you are making a smart choice for your wallet and the environment when you purchase a refurbished G3 RO system from us.
Certified Reverse Osmosis System
NSF 58 & 372 certified
  • Waterdrop reverse osmosis water filter system is tested and certified against NSF/ANSI standard 58, the TDS reduction rate is up to 91.9%.
  • Tested and certified against NSF/ANSI standard 372, Waterdrop RO system employs lead-free materials, giving you a safe product.
  • G3 RO system passed 400+ chemical lab tests, which proves that this system does not contain most chemical substances.
  • See WD-G3-W RO system test results for more
System is tested and certified by NSF International against NSF/ANSI Standard 58 for the reduction of TDS, and against NSF/ANSI 372 (≤0.25% lead).
8-stage deep filtration
  • Reduces chlorine, taste and odor, and many heavy metals, such as hexavalent chromium.
  • Improves the taste of water. Carbon block is made from supreme coconut shell, ensuring that you enjoy ultra-fresh, healthy, great-tasting drinking water.
Smart display faucet
  • The reverse osmosis water system is built with a smart display faucet.
  • The TDS monitor tells you the quality of your filtered water. *The TDS reading results may vary
  • The filter life tracker shows how soon you need to replace your filter.
  • You can enjoy an improved water-using experience and a convenient lifestyle.
Tankless design
  • Free up 70% of under-sink space, leaving your kitchen clean and organized.
Save 4X Water
  • Waterdrop reverse osmosis system saves 4X water compared to conventional RO systems.
Easy to install & replace
  • Waterdrop G3 RO system can be installed in 30 minutes, and the filter can be changed in just 2 seconds.
  • There’s no need to move the system, nor is there a need for tools.
Pure Water without Waiting
  • The highly efficient pure water flow of 400 GPD allows you to fill a cup of water in just 12 seconds
  • Water flows faster than in ordinary RO systems.
  • No more waiting for crisp water. Immediate filtration, water is always fresh!
Automatic Flushing
  • To maintain and extend the life expectancy of the filters, the system will be automatically flushed for 20 seconds after working for two hours.
  • When power is restored after a blackout, the system will be forced to flush automatically for 20 seconds.
  • The system will ensure fresh water by flushing automatically every time you shut off the tap for 5 minutes.
Holiday Mode
  • To ensure fresh and healthy filtered drinking water, the G3 Reverse Osmosis System is automatically flushed when no water is dispensed for 12 hours.
Kind notice
  • Please refer to this diagram and be informed that you need to drill a hole on your countertop to place the smart faucet (No need for this step if your countertop already has a hole). Besides, an adapter will be installed on your household water tubing to connect to RO system’s wastewater tubing and input water tubing.
  • Electricity is required to run the RO system.
  • We do not recommend using well water as source for our RO systems. We do not recommend connecting tankless RO to a refrigerator, ice maker or salt-based softener.
  • It's highly recommended to install our RO system with components provided by Waterdrop. Installing the system with any parts or accessories that are not provided by Waterdrop may cause the system to malfunction or shorten the lifetime of the system/filters.
A sip of nature doesn’t cost much
  • The remineralization filter can connect to all types of under sink water filter systems. By adding one filter, you can enjoy remineralization water with a refreshing taste. Please click here to purchase this add-on filter.
G3P600 RO Filtration System

G3P600 RO System

G3P800 RO Filtration System

G3P800 RO Filtration System


K6 Instant Hot RO System

D6 RO Filtration System

D6 RO Filtration System

G2P600 RO Filtration System

G2P600 RO Filtration System

K19 Countertop RO System

K19 Countertop RO System

Need Installation ×
Flow Rate 600 GPD 800 GPD 600 GPD 600 GPD 600 GPD 75 GPD
Pure to Drain Rate
Drain ratio stands for the ratio of wastewater and purified water dispensed by a RO system. For example, the 3:1 drain ratio means it uses up a gallon of wastewater for every 3 gallons of pure water you get.
Pure to Drain Rate Pure to Drain Rate Pure to Drain Rate Pure to Drain Rate Pure to Drain Rate Pure to Drain Rate
Faucet Smart faucet Smart faucet Smart faucet Smart faucet Ordinary faucet /
Display Filter lifespan & TDS Filter lifespan & TDS Filter lifespan & TDS & Temperature adjustment Filter lifespan & TDS Filter lifespan Filter lifespan & TDS
Self-clean ×
Holiday mode ×
Electricity Required
Filter Cartridges WD-G3-N1CF





Filter Lifespan CF-6 Mths
CB-12 Mths
RO-24 Mths
CF-6 Mths
CB-12 Mths
RO-24 Mths
12 Mths 12 Mths CF-12 Mths
P6MRO-24 Mths
12 Mths
Dimensions (inch) 18.11*5.67*17.73 18.06*5.65*17.75 6.7*17.5*16.6 15.98*5.98*11.97 17.32*5.91*13.9 13.8*7.9*16.3
CF filter
CF Filter for Waterdrop G3P800 & G3 Reverse Osmosis System
  • Pre-sediment and carbon block. Superior 3-in-1 composite filter.
  • Provides up to 6 months or 550 gallons of clean water.
  • Simple replacement: Takes only 3 seconds and just a twist to change the filter.
Total price: $29.99
Total price: $29.99
WD-G3-N3CB Filter
WD-G3-N3CB Filter for waterdrop G3P800 & G3 Reverse Osmosis System
  • Superior coconut shell activated carbon block with a smaller pore size.
  • Provides up to 12 months or 1,100 gallons of clean water.
  • 3-second replacement: Takes only a twist to change the filter.
Total price: $29.99
Total price: $29.99
WD-G3P800-N2RO Filter
WD-G3-N2RO Filter for Waterdrop G3 Reverse Osmosis System | 400GPD(not 600GPD)
  • 3-second replacement: Takes only a twist to change the filter.
  • Provides up to 24 months or 2,200 gallons of clean water.
  • Tested and certified by NSF International against NSF/ANSI standard 58. The TDS reduce rate is certified to exceed 91.9%.
Total price: $92.99
Total price: $92.99
Remineralization Filter
Remineralization Filter for All Series Waterdrop Reverse Osmosis Systems-Waterdrop MNR35
  • An excellent add-on Remineralization filter adopts materials to restore minerals.
  • Saves 8300 single-used bottles and $12600 spent on bottled mineral water.
  • Compatible with RO water system, undersink filtration systems and refrigerator.
Total price: $29.99
Total price: $29.99
CF & CB Filters
CF & CB Filters for G3 RO System, 1-YEAR COMBO
  • Waterdrop WD-G3-W Replacement Filters 1-Year Combo.
  • Pack of 2 WD-G3-N1CF Filters and 1 WD-G3-N3CB Filter.
  • It could help you save money by purchasing two CF filters and one CB filter in one kit together rather than individually.
Total price: $89.97
Total price: $89.97
CF & CB Filters and Remineralization Filter
Waterdrop G3P800 RO System Replacement Filters, 2-YEAR COMBO
  • The water filter kit provides up to 2-year of clean water for your family.
  • Pack of 4 CF filters, 2 CB filters, and 1 RO filter.
  • It could help you save money by purchasing 2-Year Combo Replacement Filters in one kit together rather than individually.
Total price: $269.93
Total price: $269.93