Tankless reverse osmosis system for under your sink
What a tankless under-sink RO unit does with 600 GPD and a smart faucet.
- $70 off the M6HG hot-water RO model
- 30-day returns, free US economy shipping
- Countertop M6 needs no plumbing
Savings differ by model and show next to each price in the store.
Get the discount
Old RO units park a pressurized tank under the sink and take most of the cabinet. The G3P600 skips the tank, and Waterdrop says that frees about 70% of the space and removes the stored water where bacteria can build up.
Output is rated at 600 gallons per day. The store says it fills a 6 oz cup in about 6.5 seconds, which is quick enough to top up a kettle or a pasta pot without waiting.
Filtration runs through eight stages with a 0.0001 micron RO membrane. The listing names TDS, PFOA, PFOS, chlorine, fluoride, arsenic and lead among the substances it reduces, and the system is listed under NSF/ANSI 42, 58 and 372.
The faucet swivels and carries a display with a TDS reading plus CF, RO and CB filter indicators. Filters twist out in about 3 seconds, the RO element lasts 24 months, and the whole unit installs in roughly 30 minutes without a plumber.
If you want more flow, the X12 offers 1200 GPD and the X16 goes to 1600 GPD, both with 11 stages. The $70 off on the M6 hot model is a countertop deal, so for the sink the seasonal sale is the one to check.
Deals you can use now
| Deal | Code | Conditions |
|---|---|---|
| SaleSeasonal sale on RO systems, filters and pitchers | — | Savings differ by model and show next to each price in the store. |
| $70$70 off the M6 instant hot RO system | — | The store shows the $70 on the M6HG hot model; the M6H lists its own price cut. Final price appears at checkout. |
See Waterdrop in detailPure RO water, hot or cold on tapA glass pitcher that goes everywhere · Plug in and pour, no plumbing · A faucet that shows TDS and filter life · 2 parts pure water for every 1 of wasteFAQ
How much space does the G3P600 free up?
Waterdrop states it saves about 70% of under-sink space compared with a tank-based unit, since it has no storage tank.
How long does installation take?
The listing says about 30 minutes for a DIY setup, and the box includes the faucet, tubing, lock clips and a drain saddle.
How often do I change filters?
The CF filter lasts 6 months, the CB filter 12 months and the RO filter 24 months, according to the product page.
What is the warranty?
The G3P600 carries a 1-year warranty, while the larger X16 has 2 years.
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