Please note: This page may contain affiliate links. If you buy a product or service through such a link we earn a commission at no additional cost to you. Learn more about our product review process or check our FTC affiliate disclosure.
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 RO System
|Filtered Water:||0.28 Gallons Per Minute|
|Filtered Water:||1 Gallon in 10-15 Minutes|
|NSF Certifications:||42, 53, 58, 401, P473|
We’ll start with the WD-G3-W. It uses the following filter layers/stages:
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:
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 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:
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:
Waterdrop WD-G2 filters:
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.
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.
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!
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.
This completes our Waterdrop reverse osmosis review. Questions? Ask away!
Sign up to join 1,000+ subscribers and get notified about new BOS guides & checklists as well as exclusive product sales and discount codes.