GREATWELL ROG400 Tankless Reverse Osmosis Water Filtration System with 400 GPD RO Filter 1.5:1 Pure to Drain Ratio and Drinking Water Faucet
$598.99
About this item
- ROG400 is a tankless reverse osmosis system. The vertical filter placement design saves more than 30% of space under the sink compares to a horizontal design. A leak-free integrated water route and filter change indicator.
- The PAC filter is a combination of two sediment filters and a carbon filter that removes sand, rust, chlorine, odor, and smell. The RO membrane removes up to 99% of over 1,000 contaminants, including PFAS, lead, fluoride, arsenic, asbestos, and more for up to 3 years. The AC or the active carbon filter made from coconut shell further polishes water removing odor and bad taste.
- With a built-in water pump and GE reverse osmosis membrane rated at 400 GPD, the water flow rate from ROG400 is at 0. 3-0. 4 gal./min., with a pure to wastewater ratio (up to 1.5 : 1).
- DIY installation and future filter replacement. The unit can be connected to the ice maker/refrigerator. It includes an artisan-style stainless steel drinking water faucet.
- At GreatWell, we only use quality components tested by an independent 3rd party against NSF/ANSI standards. Lifetime technical support provided by our dedicated support team based in Atlanta, GA.
Frequently Bought Together

GREATWELL Tankless Reverse Osmosis Water Filtration System with 400 GPD RO Filter 1.5:1 Pure to Drain Ratio and Drinking Water Faucet
$598.99
- Availability: In Stock
- Model: ROG400
- Manufacturer: iSpring
Write Review
Roger Caldwell | 
2018-11-07
System went together great, once I realized I had the hot and cold reversed in my cabinet, I was fine. And do make sure you push the plastic hose in real hard, or youll have a couple of leaks, lol. My purpose was to get water that was pure for my humidifiers, and distilled water is .89 a gallon x 4 gallons per day, way too expensive to get rid of the white dust. Using the RO water for these has eliminated the white dust; humidifier issue, plus the water is good for me and my aging cat. So I am quite happy with my new addition. And the fact that these have such good reviews helped me in my decision to buy. Plus, if you call about something, they answer the phone right off!! Where else can you get that these days?? Plus they are ns and understand what you are saying!!! Amazing :)

2018-11-07
System went together great, once I realized I had the hot and cold reversed in my cabinet, I was fine. And do make sure you push the plastic hose in real hard, or youll have a couple of leaks, lol. My purpose was to get water that was pure for my humidifiers, and distilled water is .89 a gallon x 4 gallons per day, way too expensive to get rid of the white dust. Using the RO water for these has eliminated the white dust; humidifier issue, plus the water is good for me and my aging cat. So I am quite happy with my new addition. And the fact that these have such good reviews helped me in my decision to buy. Plus, if you call about something, they answer the phone right off!! Where else can you get that these days?? Plus they are ns and understand what you are saying!!! Amazing :)
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ROG400 Manual