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RO Water Filter System
RO Water Filter System
RO Water Filter System
RO Water Filter System

RO Water Filter System

WD-D6-B, 600 GPD Fast Flow, Tankless, 1.5:1 Drain Ratio, Smart LED Faucet, Reduce TDS, USA Tech Support

9 reviews
  • Advanced composite filter, making 5 filters into 1 filter. Enjoy better filtration with a large filter surface.
  • 600GPD, faster water flow ensures you fill up a cup of water in just 8 seconds.
  • 1.5:1 low drain ratio. More pure water but less waste water.
  • Smart faucet with a screen for real-time monitoring water quality. Water is always safe to drink.
  • The tankless design prevents bacteria and viruses from building up.


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  • Advanced composite filter, making 5 filters into 1 filter. Enjoy better filtration with a large filter surface.
  • 600GPD, faster water flow ensures you fill up a cup of water in just 8 seconds.
  • 1.5:1 low drain ratio. More pure water but less waste water.
  • Smart faucet with a screen for real-time monitoring water quality. Water is always safe to drink.
  • The tankless design prevents bacteria and viruses from building up.
Model number
Total Filtration Capacity
1000 gallons
System cover: BPA-free plastic
Faucet: metal
CF filter: sediment PP membrane & activated carbon block
M3.Fist Filter: First PP cotton, activated carbon block, second PP cotton, reverse osmosis membrane, post-activated carbon block.
Product dimensions
15.98 x 5.98 x 11.97 inches
Item Model Number
Componets Included
System cover, smart faucet, feed water adapter, MRO filter, CF filter, PE tubing*3, drain saddle, lock clip, and Teflon tape®.
Flow rate
600 gallons per day (GPD)
Usage environment
Indoor use only
Wall plug
Removable contaminants:
TDS, chlorine, taste and odor, chloramine, scale, turbidity.
Carcinogens: chromium (hexavalent), chromium (trivalent), cadmium and cadmium compounds, ferric oxide.
Heavy metals: lead, mercury, barium, copper, radium 226/228, aluminum.
Microorganic contaminants: cysts.
Inorganic pollutants: arsenic and inorganic arsenic compounds, fluoride.
6.Organic pollutants: asbestos, benzene, formaldehyde, lindane, phenytoin nitrate/ nitrite bisphenol A, trichloromethane, chlordane, PFOA & PFOS, etc.
Waterdrop has become a well-known and professional water filtration brand. We never slow down our research in providing water of the highest quality in the most convenient ways. Our mission is to meet the clean water demands of our customers.
We believe that drinking clean water is a basic right and are committed to delivering clean water to everyone. Waterdrop RO water filter system is an innovative, all-in-one, intelligent water purification system.
Together with The Water Project, we have invested in better sanitation for schools in Africa to support better futures for children. Every time you buy one filter, one child will get one day’s supply of clean water. Thousands of students and families have benefited from this project.
Waterdrop Reverse Osmosis System and Water Filter uses Dow RO membrane to effectively remove over 1,000 harmful substances. Any particles larger than 0.0001 μm will be filtered out through its multi filtration. Compared with other under sink water filter for home, Waterdrop reverse osmosis water filter is the right water purifier and reverse osmosis system to remove fluoride, TDS, scale, heavy metals, etc. Waterdrop D6 RO water filter system is suited to large household. The compact filters offer excellent performance, and due to the composite filters and formula, you won’t have to replace the filters in six months, as you would with other RO water purifiers. The innovative tankless design saves space and ensures faster water flow and purer water. Waterdrop reverse osmosis water filtration system is an innovative, all-in-one intelligent water filter system. In just a few minutes, Waterdrop RO water system can be installed completely, and in just three seconds, the filter can be changed with one single turn. Installation is that easy! It is a smart RO system with composite RO membrane and tankless design in the U. S. market. The water filter for sink provides six stages of filtration. The composite integrated filters result in more effective filtration. The D6 Reverse Osmosis System FIST filer has first PP cotton , activated carbon block , second PP cotton , reverse osmosis membrane and post-activated carbon block. It removes sediment, rust, large particles, colloids, chlorine, fluoride, scale, etc. The reverse osmosis membrane filter adopts an innovative design, and the efficiency of the filter equals more than six stages of filtration. Additionally, the activated carbon block uses high-grade activated carbon granules made from natural coconut shell, which will also return beneficial minerals into the water and improve the water taste. Waterdrop reverse osmosis water purifier uses new composite filter element technology to more efficiently filter out harmful substances. The tankless reverse osmosis water system design helps you avoid secondary pollution and enjoy more storage space in your kitchen. Thanks to its internal pump, the RO water purification system offers faster water flow (600 gallons per day). The Waterdrop reverse osmosis drinking water filter system can filter a cup of water in about 12 seconds. It can produce pure water quickly, thereby meeting the needs of your whole family and even small companies. Compared to traditional RO systems, Waterdrop Reverse Osmosis Water Filtration System saves wastewater by 300%. Saves money on your water bills while running Waterdrop RO filter system. Waterdrop reverse osmosis filter system has passed 400+ chemical lab tests, proving that this system does not contain 400+ chemical substances, such as bisphenol A, formaldehyde, benzene, lead, cadmium, and so on. Waterdrop RO purifier is the RO water purifier for your home water filtration system!
Why is there a delay in the water output after I turn on the faucet?

Waterdrop D6 RO has an advanced pump and RO membrane to ensure instant filtration that no traditional RO system can achieve. You should allow some time for the pump to activate after the faucet is turned on.

Why does the panel show that the TDS level is very high during the first 2 seconds after the system is turned on?

This is because the TDS reading is the TDS level of the input water. Two seconds later, the panel will show the TDS level of the filtered water.

Can the RO water filter system be connected to the refrigerator?

No. This is because different refrigerators have different requirements in terms of water pressure, and our RO system cannot possibly provide for them all. Connection under mismatched circumstances may result in many problems, including, but not limited to, slow ice-making, frequent start-stop issues, etc. Therefore, it's NOT recommended that you connect the RO system to your refrigerator.

Why does Waterdrop cost more than other water purifiers?

Because Waterdrop employs advanced materials and invests in the improvement of product quality. Moreover, our researchers invest time, employ advanced technology, and carry out various professional tests to develop our products. Our reverse osmosis membrane has an accuracy of 0.0001 μm and can filter out 1,000+ invisible hazardous substances in tap water. Waterdrop continuously improves product quality to meet all consumer needs.

How do I install Waterdrop RO water filter system?
Along with a well-organized instruction manual, you can find a step-by-step RO water filter system installation video on the Waterdrop YouTube channel.
How often do I need to change the filter?

Filter use: 12 months or 1,000 gallons, whichever comes first.

Removes 99.99% of Harmful Contaminants
Removes 99.99% of Harmful Contaminants
Removes 99.99% of Harmful Contaminants
  • The first PP cotton layer filters out sediment, rust, and other large particles.
  • The activated carbon block layer removes organic matters and chlorine.
  • The second PP cotton layer further removes suspended matter and other impurities.
  • Reverse osmosis membrane layer has a filtration accuracy of 0.0001 μm, intercepting salt, atrazine, nitrates, PFAS, lead, sodium, chromium, benzene, etc.
  • The post-activated carbon block layer removes taste and odor, improving the taste of water.
Composite filter technology
600 GPD Fast Water Flow
600 GPD Fast Water Flow
  • With a water flow rate of 0.42 gal/min, you will fill up a cup with water in 8 seconds.
  • With an innovative internal pump, D6 has a fast flow rate of 600 gallons per day.
  • Flow is fast but the filtration performance is promised, because Waterdrop has been upgrading technology to make better pump and filter with larger membrane size.
Less Waste Water
  • Dispensing 1.5 cups of pure water will only produce 1 cup of waste water.
  • D6 saves 450% of water compared to traditional reverse osmosis systems.
Less Waste Water
Smart Designer Faucet
Smart Designer Faucet
  • The smart designer faucet has a real-time TDS display to help you monitor the water quality 24/7.
  • The faucet screen also displays the service life of the filter, which reminds you to replace the filter in advance.
Huge DOW® RO Membrane
Huge DOW® RO Membrane
  • With a pore size of 0.0001 µm, this filter stands out amongst others for its better filtration and longer service life. It removes 99% of viruses, harmful chemicals, heavy metals, pesticides, etc.
Tankless Design Saves Under-sink Space
  • D6 reverse osmosis system employs tankless design and integral composite filter. Compared to traditional reverse osmosis systems, the compact size of the D6 saves 70% of your under-sink space.
  • The tankless design also prevents recontamination in the water tank.
  • The D6 reverse osmosis system has passed thousands of tests to lower the noise and avoid water leakage. You can barely hear anything after closing the cabinet.
  • The noise is quieter than a running computer.
Tankless Design Saves Under-sink Space
Easy Set-up
Easy Set-up
  • D6 RO system is designed for DIY installation within 30 minutes.
  • The push-in replacement design allows you to replace the filter in 3 seconds without moving the system or using any tools.
  • If using well water as the source, please make sure the water is pre-filtered.
  • The system needs electricity.
  • The system can not be connected to the refrigerator.
Integrated Design
  • Reduces water & electrical leaks
  • Few connectors avoids complex installation
  • Multiple & rigorous tests to ensure quality performance
Integrated Design
Your Purchase, your Love
Your Purchase, your Love
  • Every time you buy a Waterdrop product, we will provide one day of clean water to a child in need.
Customer Reviews
4.6 Based on 9 Reviews
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Filter Reviews:
Wade S.
Great tasting healthier water! What’s not to love.

This system is great!!! U really can’t put a price on truly clean drinking/cooking water for your family. There’s no telling what’s all in the tap water these days. I can tell u this I tested a glass prior & after the installation and there was a definite difference according to my test strips not to mention the flavor. Installation is pretty straight forward no need to call a professional. Even the dog is happy with his water.!.!.!.

Dane A.
As long as you have the right setup, this is a great product!

Love how much water it saves compared to others & how I can maintain it myself

Jenn H.
Well made, high quality product. Love having purified water for our kids and plants!

We are really loving this Waterdrop RO system. We installed it in our basement kitchen, which is adjacent to the kids’ playroom and also our grow room for our hydroponic veggies. So, we were excited to have purified water for us to drink as well as provide better quality water for our plants. Installation was easy and the instructions were clear; it took my husband a solid hour, maybe a little more. We removed our existing sink sprayer and it fit well in that hole. It includes all you need for installation, including the filter. Speaking of, the replacement filter is about $100, but it only needs to be changed about once a year. I feel like a hundred bucks a year is so much cheaper than buying purified bottled water; and worth it to avoid drinking contaminants in our tap water, so I’m fine with that cost. The faucet is a nice design, and the finish is smooth. Operation is simple and is very quiet. You can fill a cup in about 8 seconds; takes about a minute for a half-gallon. The system fit well under the sink. And the water tastes great! Overall we are extremely satisfied with this high quality and high performing product. Five stars!

Waterdrop RO Water Filter System Review
Fantastic, good brand, best way to filter water

We are big fans of Waterdrop. Reverse osmosis is by far the best way to filter water. So, this is a seriously great way to get clean, drinkable water.The only downside is that the faucet is a bit slow so it takes some time to fill things up.The replacement filters aren't too expensive when you consider that one filter can last up to a year.Realistically...we are thinking that we may want a system that does the whole house.

I l.
Coming from the G2 600GPD and this is an improvement!

Noise: This unit does product noise while being used, but with cabinet doors shut it is not loud. I only hear it when getting water late at night. Definitely not bad and not an issue for me.Water quality: I compared TDS with my Apera TDS meter and the faucet reading is accurate or within an acceptable margin. Since this is tankless, if you don't use the ro system for a few hours, it takes 10-30 seconds to clear out the standing water and lower TDS. My tap TDS is 400-750TDS depending on heat (Phoenix AZ). This unit brings my TDS down to 20-40.Water waste: The reason I replaced my G2 GPD600 is the fact that this unit wastes less water. 1.5 to 1 is excellent for tankless.Filter: 1 filter replacement? Wow how convenient. With that said I am still on the fence. Different types of filtration clog quicker than others. The G2 has 2 filters. A 1 year filter and a 2 year filter. The short lived filter is cheap to replace. With this unit, there is one filter and it is expensive. The large particle filters will wear out faster that the rest, so combining them all may be wasteful. I am not sure, and this is just speculation.Installation: Since I was replacing an existing WaterDrop tankless system, install was only a few minutes. Same easy installation applies. This unit is smaller than the G2 GPD600, although, not by a huge margin.This is a quality unit. If you want more info about installation, look at the G2 GPD600 product page.