Waterdrop Filters Review – WD-G3-W and WD-G2 Reverse Osmosis Water Systems

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Waterdrop sells 2 reverse osmosis systems that are highly popular at the time of writing this review. One is the WD-G3-W and the other the WD-G2 (the latter is available in 2 different colors). Both are tankless under sink systems meaning they filter water on-demand instead of storing it in a bulky tank. This saves quite a lot of space, and, although not that important, it looks better, too.

On top of that, in order to provide water safe for drinking the Waterdrop WD-G3-W and the WD-G2 remove more than 1,000 harmful contaminants, says the company. Sounds far-fetched? Let’s find out!

Side note: Our go-to reverse osmosis system is the AquaTru. It’s a countertop unit (installation-free) that’s not tankless but purifies a full gallon in 10-15 minutes, so that you can easily filter water on-demand with no need to store it. The main reason why we favor the AquaTru countertop RO system over both Waterdrop models is because of 5 NSF certifications for the guaranteed removal of 80+ contaminants. Simply put, the AquaTru has proven its filtration capabilities in independent lab testing; the Waterdrop WD-G3-W and WD-G2 not really.

Waterdrop WD-G3-W vs. AquaTru

Waterdrop WD-G3-W Tankless Reverse Osmosis Water Filtration System

Waterdrop WD-G3-W Tankless RO System

Filter Stages:3
Filtered Water:0.28 Gallons Per Minute
NSF Certifications:58
Annual Cost:~$115

Our Rating

AquaTru 4-Stage for table or counter top


Filter Stages:4
Filtered Water:1 Gallon in 10-15 Minutes
NSF Certifications:42, 53, 58, 401, P473
Annual Cost:~$100-120

Our Rating

Waterdrop Filters Review – Key Features

We’ll start with the WD-G3-W. It uses the following filter layers/stages:

  • Composite filter (CF), 3 layers – First a composite filter uses 2 polypropylene cotton and one coconut shell activated carbon block filter layer to remove chlorine, bad taste and odor, sand, rust, and other larger solids.
  • Reverse osmosis filter membrane – With a pore size of 0.0001-micron, the DOW reverse osmosis membrane rejects just about everything a typical RO membrane rejects: Lead, chromium, arsenic, bacteria, viruses, and much more.
  • Carbon block filter (CB) – Lastly, an activated carbon post-filter gives the water a finishing touch improving aesthetics.

As far as the WD-G2 is concerned, it only uses 2 filter elements instead of 3. And one element is smaller compared to the WD-G3-W which is why the system is even slightly more compact:

  • Composite filter (CF), 2 layers – This composite filter combines 1 polypropylene cotton layer with a coconut shell activated carbon block filter.
  • Membrane composite filter (MRO), 3 layers – The MRO has an outer polypropylene sediment filter layer, an inner 0.0001-micron DOW reverse osmosis membrane layer, and finally an activated carbon block core.

We can expect the same water contaminants to be reduced as with the WD-G3-W, but at lower rates.

What about the claim that Waterdrop reverse osmosis systems remove more than 1,000 harmful contaminants? Well, that’s difficult to assess. Only the WD-G3-W unit is NSF Standard 58 certified – for 94% TDS rejection. That said, reverse osmosis water purification has proven itself over the years. We have little doubt that both systems effectively remove a wide range of chemicals, heavy metals, salts, etc. Still, we always prefer thorough testing against NSF standards.

Min/max required feed water pressure: 14.5-87 psi.

Waterdrop Under Sink Reverse Osmosis Water Filter Pros

More pros:

  • Foregoing a bulky tank allows for more free room under your kitchen sink.
  • Waterdrop reverse osmosis systems were designed with a DIY install in mind. #moneysaver
  • An internal pump increases water pressure. 0.28 gallons per minute water flow rate means you never run out of purified water. If you do the math, you get 1 cup of RO water in little more than 10 seconds. No long waiting times!
  • The pressure pump also reduces the amount of wastewater that goes down the drain. While a standard RO model wastes 3-5 gallons per 1 gallon of filtered water, Waterdrop systems only waste 1 gallon.
  • The plastic is BPA-free to avoid contamination and the dispenser is metal for durability.
  • Speaking of, the WD-G3-W features a “Smart faucet”. When the built-in LED light is blue, your filters should be working just fine. The light turns yellow as soon as the remaining filter capacity is less than 40 gallons respectively 15 days. If you see red light you need to change one or more of the filters immediately. Similar lights are found on the WD-G3-W system itself as well as on the WD-G2. And they beep while you’re dispensing water. So you don’t have to worry about when to replace each filter element.
  • What’s more, the WD-G3-W has a TDS monitoring panel which tells you at a glance how effective the filter elements, and the reverse osmosis membrane in particular, still are.
  • Replacing filters is incredibly easy. There’s no need to shut off the feed water or to disconnect anything. Each cartridge can be removed and installed with a single turn – completely tools-free!
  • Other functionalities include auto-flushing when no water has been dispensed for 24 hours to prevent fouling, and a leak protector which turns off the system after it’s been continuously producing water for more than 33 minutes.
  • Waterdrop offers a money-back satisfaction guarantee that allows you to return your product within the first 30 days after purchase for a full refund. Plus, there’s a 1-year manufacturer warranty but only when the systems are used on municipal water!


Waterdrop says their under sink reverse osmosis systems can be installed within 30 minutes. We think 1-2 hours is probably more realistic – still fast!

You shouldn’t have any problems completing the project if you’re handy around the house and have the necessary tools. Just follow the provided instructions. You’ll need a drill for the hole to accommodate the extra faucet (unless there already is a second hole in your sink or countertop) and you also have to drill into your drain pipe for the drain line connection.

Another critical step is turning off the cold water supply so that you can install the feed water adapter.

Once everything is up and running, you need to flush the system for 30 minutes. The WD-G3-W’s smart faucet will stop blinking afterwards. The front panel screen will also start displaying the TDS reading. As for the WD-G2, the indicator lights on the front panel will change from flashing to permanent blue once the process is completed.


Not sure if you can do this? Check out this helpful installation video:


  • System housing
  • Composite filter (CF), 3 layers (WD-G3-W only)
  • Reverse osmosis filter membrane (WD-G3-W only)
  • Carbon block filter (CB) (WD-G3-W only)
  • Composite filter (CF), 2 layers (WD-G2 only)
  • Membrane composite filter (MRO), 3 layers (WD-G2 only)
  • RO faucet
  • Drain saddle
  • Feed water adapter
  • Tubing
  • Lock clips
  • Teflon tape
  • Power adapter

Filter/Membrane Replacements

Like we said, replacing any of the filter elements on a Waterdrop RO system is child’s play. It literally takes less than 10 seconds. Simply remove the old cartridge by turning it counter-clockwise. Then install the new filter by turning clockwise. That’s all!

Oh, and remember to reset the filter life indicator. You can simply follow the instructions in your manual. It’ll also tell you about flushing requirements.

What are the annual cost? We estimate about $115 for the WD-G3-W and roughly $65 for the other. By the way, the manufacturer recommends biannual/annual replacement:

Waterdrop WD-G3-W filters:

  • Composite filter provides you with up to 6 months or 550 gallons of filtered water
  • Reverse osmosis filter membrane lasts 2 years or 2,200 gallons of filtered water
  • Carbon block filter needs replacement after 12 months or 1,100 gallons

Waterdrop WD-G2 filters:

  • Composite filter is good for up to 12 months or 1,100 gallons of clean water
  • Membrane composite filter provides up to 2 years or 2,200 gallons of clean water


A manual for the larger Waterdrop reverse osmosis system is linked in the product description here.

A manual for the smaller Waterdrop reverse osmosis system is linked here.

Waterdrop Under Sink Reverse Osmosis Water Filter Cons

Chloramine, hexavalent chromium, cadmium, lead, mercury, barium, copper, radium 226/228, aluminum, cysts, arsenic, fluoride, asbestos, benzene, nitrate, nitrite, PFAS – Waterdrop lists all these contaminants and more saying they’ll be removed by their tankless RO systems, but to what percentage?

Furthermore, a few people reported that they have to drain about 1 gallon of water before their TDS panel reads 10 to 30 ppm. Not using the system for more than 1 hour leads to a TDS above 100. We cannot explain this phenomenon. It might be a hardware or software error.

Waterdrop Reverse Osmosis Review: Our Verdict (+ What to Buy Instead)

The Waterdrop WD-G3-W is among the highest priced reverse osmosis system we know, and the WD-G2 isn’t exactly cheap either! And yet still, people love the sleek design, they love the simple install, they love the quick filter replacements, and they say the water taste is fantastic.

In our opinion, both are worth 4 stars. The only reason why we choose the Waterdrop WD-G3-W as our #1 tankless reverse osmosis system is because we assume it reduces contaminants at higher rates.

Finally, we already mentioned in the introduction that our favorite reverse osmosis system is the AquaTru anyway, due to its NSF certifications (Standard 42, 53, 58, 401 and P473). Contaminants that will be removed include lead (99.1%), fluoride (93.5%), chromium-6 (97.2%), cyst (99.99%), PFOA & PFOS (97.5%), dozens of VOCs, and pharmaceuticals. The AquaTru is also very simple to set up and considerably cheaper than the Waterdrop WD-G3-W. So if it doesn’t have to be a tankless unit make sure to check the system out!

Looking for More Reviews?

If you want, we have more reviews of tankless reverse osmosis systems.

You’re interested in all types of RO water filters? Check our overall toplist here.

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This completes our Waterdrop reverse osmosis review. Questions? Ask away!

About the Author Gene Fitzgerald

Gene Fitzgerald has been with BOS since the very beginning. She is head of content creation and has fully immersed herself into the home water treatment industry only to become an expert herself. Outside of BOS, Gene loves reading books on philosophy & social issues, making music, and hiking.
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