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

RO Water Filter System

Part Number: WD-D6-B

38 reviews


In Stock
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  • Advanced composite reverse osmosis filter, 5 filters into 1 filter. Enjoy better filtration with a large filter surface.
  • Provides over 600 gallons per day of cleaner, safer drinking water.
  • 1.5:1 low drain ratio. More pure water but less waste water.
  • The D6 RO water filter system comes with a smart designer faucet which is made of lead-free, brushed nickel that has a high-end screen. The screen shows the real-time TDS level and the remaining life of the filter.
  • The tankless design prevents bacteria and viruses from building up.
Model number
Total Filtration Capacity
1000 gallons
System cover: BPA-free plastic
Faucet: metal
Filter model: WD-D6RF
Filter materials: First PP cotton layer, activated carbon block layer, second PP cotton layer, RO membrane layer and post-activated carbon block layer.
Product dimensions
15.98 x 5.98 x 11.97 inches
Flow rate
Componets Included
System cover, smart digital faucet, feed water adapter, PE tubing*3(79”), drain saddle, lock clip, power adapter(main power cable 73”, faucet’s power cable 59”)

What is new about the Waterdrop D6 RO water filter system?

The five-in-one composite filters in the Waterdrop D6 Water Filtration System combines multiple filtration technologies into one.

The first PP cotton layer filters out sediment, rust, and other large particles.

The activated carbon block layer removes organic matter and chlorine.

The second PP cotton layer further removes suspended matter and other impurities.

The reverse osmosis membrane layer has a filtration accuracy of 0.0001μm, which intercepts TDS, salt, nitrates, PFAS, lead, sodium, chromium, benzene, etc.

The post-activated carbon block layer removes taste and odor to improve the taste of water.

What impurities can D6 RO water system remove?

The FIST composite filter, specially adopting DOW RO membrane can conveniently remove 99.99% of pollutants including TDS, lead, chlorine, salt, nitrates, PFAS, lead, sodium, chromium, benzene, etc. The filtration process also eliminates bad taste and odor, leaving you with clean and great-tasting drinking water.

How to read the TDS? And why are there two numbers?

The faucet offers a real-time TDS display of your water quality at any point in time. The in-built LED and TDS sensors become active when the faucet is on. D6 reverse osmosis filter system has two TDS detectors, detecting TDS level before and after filtration respectively. It shows TDS level before filtration at first and then indicates TDS level after filtration two seconds later.

Does this home reverse osmosis system fit in my under sink?

It’s of 15.98 x 5.98 x 11.97 inches size and is the smallest 600GPD RO system in the market. The D6 adopts a simple tankless design. It requires little space in your kitchen and can conveniently sit under your sink without obstructing your perfect kitchen interior.

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.

What is RO water filter system?

Reverse osmosis (RO) is a water purification process that uses a partially permeable membrane to remove ions, unwanted molecules and larger particles from drinking water. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side.

Does this reverse osmosis water system remove chromium?

All of our reverse osmosis water filtration system are designed to remove 94-99% of Chromium-6 in your water.

How well does this RO water filter system remove nitrates?

All of our reverse osmosis water filter systems are designed to remove 85-90% of Nitrates in your water.

Does this RO water system remove chemicals used to soften water?

This system will remove chemicals in the water as well as sodium from a salt-based water softener.

Can this filter be used as a reverse osmosis water system for home?

No. This RO water system is just a point-of-use water treatment system.

Will this reverse osmosis filter system completely remove fluoride?

All of our reverse osmosis water filtration systems are designed to remove 94-99% of fluoride in your water.

Can I use this reverse osmosis filter system with well water?

Put a sediment filter inline before reverse osmosis filter - that should work fine.

Does this home reverse osmosis system require an under-sink electrical outlet?

Since the system has the booster pump it will require an electrical outlet for the system to work.

Does this RO water filter system remove salt from my water softener?

Yes, the whole house reverse osmosis will remove dissolved solids such as sodium or salt from your home's source water.

Does this reverse osmosis water filter system lower the pH of the water?

Yes, this reverse osmosis filter system should or could reduce pH but it depends on the source water and the mineral content of the source water.

Reduce Harmful Contaminants
Reduce Harmful Contaminants
Removes 99.99% of contaminants
  • Waterdrop D6 RO water filter system adopts a 5-in-1 composite reverse osmosis filter with the DOW reverse osmosis membrane that has a pore size of 0.0001μm. This reverse osmosis filter is capable of removing over 1,000 harmful contaminants from water, including TDS, lead, chlorine, salt, nitrates, PFAS, lead, sodium, chromium, benzene, etc. Now you can enjoy high-efficiency filtration with just one filter!
Composite filter technology
600 GPD Fast Water Flow
Faster water flow and lower waterwaste
  • Waterdrop D6 reverse osmosis water system is upgraded to have a flow rate of 600 GPD and a drain ratio of 1.5:1.
  • With an innovative internal pump and a larger filter surface, you can fill a cup of water in 8 seconds so that you can get water immediately without waiting for a long time, which is ideal for cooking and drinking.
  • The improved drain ratio means that dispensing 1.5 cups of pure water produces only 1 cup of wastewater, saving 450% of water compared to a conventional water filtration system for home.
Smart and stylish faucet
  • The RO water system comes with a smart and stylish faucet that has a high-end screen. The screen shows the real-time TDS level and the remaining life of the filter. It is waterproof, so you do not have to worry about electrical leakage. D6 reverse osmosis filter system saves you time and effort by monitoring filter’s life for you with the help of an indicator on the control panel.
Less Waste Water
Smart Designer Faucet
Easy installation
  • D6 home reverse osmosis system is designed for DIY installation within 30 minutes.
  • The push-in replacement design allows you to replace the reverse osmosis 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.
  • If you are using well water, we recommend applying a pre-filter (5-10 μm).Placing this RO after a salt-based water softener may affect the taste (reduce rate 90%)We do not recommend connecting tankless RO to a refrigerator or ice maker.
Huge DOW® RO Membrane
Effective DOW® RO Membrane
  • With a pore size of 0.0001 µm, this reverse osmosis filter stands out among others for its better filtration and longer service life. It removes 99% of viruses, harmful chemicals, heavy metals, pesticides, etc.
Elegant tankless design
  • D6 RO water filter system employs tankless design and integral composite filter. Compared to traditional reverse osmosis water 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 home 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 sound is quieter than a running laptop.
Tankless Design Saves Under-sink Space
Easy Set-up
Advanced integrated circuit
  • The D6 reverse osmosis filter system has a composite water circuit, which greatly reduced water leakage compared with traditional whole house reverse osmosis. We improve seals and reduce connectors that exposed to the water circuit as well to achieve a better sealing effect.
Work smarter, drink better
  • D6 RO water system has an advanced automatic flushing function and a water leakage protection system. Automatic self-flushing ensures the system always operate in a clean condition. Water leakage protection notifies you water of leakage in time, which avoids further risks and loss.
Integrated Design
Your Purchase, your Love
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.
Customer Reviews
4.7 Based on 38 Reviews
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Filter Reviews:
Joan W.
Easy install. Works as described.

Easy install. Works as described.

Great water. Love it.

Great company and great clean water

Taryn T.
Great quality small size 600 GPD RO system with an amazing faucet and a few minor issues

This is probably one of the smallest if not the smallest tankless RO system that I've seen. So small that we almost ended up being able to keep the Insinkerator under the sink "and" install this adjacent to it. Now that's amazing for an RO system of this quality.
One advantage (can be considered a disadvantage too) is that this RO system only runs on 1 single filter with five stages of filtering that supposedly does everything. On the plus side, it takes way less space and on the downside, you have to replace the filter faster and the filter is also more expensive, but believe me, it's well worth it when you get to save more of the precious space underneath your sink. However, if you have hard water with sediments, I would recommend adding pre-filtration to save money on filters and extend the life of the system.
The installation is relatively easy and takes less than an hour (including the faucet installation), the only thing that you might have to do is drill a hole for the drain and there rest is plug and play lol
The capacity is 600 Gallon Per Day which is amazingly high again for such a small system that is tankless and the drain is also pretty low.
Another cool thing about it is the nice looking and smart faucet that's included. Most newer RO systems have a TDS monitor but you usually have to check under the sink. On this RO system, they integrated the TDS display in the faucet so you can always see what kind of a water you are drinking. It also shows you the life of your filter which again eliminates the need to continuously check under the sink.
It is pretty quiet in general, if you close the cabinet door you won't hear it outside of the kitchen even when it's working in full capacity.
One minor downside is the drain ratio, most other good tankless RO systems have a 2:1 purified to wastewater ratio meaning for every 2 gallons of purifies water they generate 1 gallon of wastewater. This Waterdrop system However, only generates 1.5 Gallons of purified water with the same 1 gallon of wastewater. In other words, the 600 Gallon Per Day capacity if 100% used, would generate around 400 Gallons of wastewater, while other better RO systems only generate 300 Gallons of wastewater.
Another minor disadvantage is that Frizzlife has this thing called remineralization that adds some minerals and some nice taste to the water but this Waterdrop system doesn't remineralizer and cannot add taste to the water.
I personally expected 600 GPD to have way faster flow but tbh it's still disappointing. It can never give you the pressure you were getting with systems with tanks but obviously you get the benefit of saving a lot of space.
One last minor disadvantage that might seem unimportant but believe me it is, is that the filter on this RO system can only be replaced from the back, which makes it really inconvenient and burdensome.
Overall, a very nice compact system of high quality and very high GPD capacity that I strongly recommend. I dropped one star for expensive filter that need to be frequently replaced, for the lack of remineralization, for the 1.5:1 drain ratio instead of the better 2:1 and the fact that filter replacement is done from the back and can be a headache.

Shyam F.
Great buy. Right choice!!

Installation was relatively easy. There was one step to put the lock on the tubes which was a little tricky. The locks were so small to quickly perform. The taste of water is great. No metal taste or color. Looks sleek, quiet and effective. Very happy with the purchase. I have recommended to many of my friends already.

Waterdrop RO Reverse Osmosis Water Filtration System

Easy to install. Water taste great. The compact size of the unit makes for reducing space needed to install. Mostly uses vertical space, the horizontal footprint is quite small for what it does. The pump isn't completely silent but is much quieter than I imagined it would be. I can barely hear it while the cabinet doors are closed, and it also only runs while the faucet is on.