GREATWELL 400 GPD Tankless Reverse Osmosis (RO) Water Filtration System with 1.5:1 Pure to Drain Ratio and Drinking Water Faucet

  • Fast water flow that produces a water ratio up to 1.5:1 of pure water to wastewater. The flow is rated at 0.3-0.4 gal/min.
  • Superior filtration results. The 3-stage process removes up to 99% of over 1,000 contaminants, including lead, chlorine, fluoride, arsenic, asbestos, calcium, sodium, and more.
  • Unique leak-free integrated water route, space-saving tankless design, and true filter change indicator make this system outstanding.
  • Premium quality components tested by an independent 3rd party against NSF/ANSI standards. Use of FDA-approved material in all parts.
  • Customer satisfaction is our top priority. All GREATWELL products come with 1-year limited manufacturer warranty, lifetime technical support provided by our dedicated support team based in Atlanta, GA and available at support@greatwellfilter.com.Buy now RISK-FREE today and experience the GREATWELL's difference. Note:The other sellers are not authorized, please be attention!
  • $478.99
    • 5.0 out of 5 stars
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    • Premium Components - Cut No Corners

      All ROG400 parts are manufactured to comply strictly with FDA (CFR-Parts 174) and NSF/ANSI standard (58 for reverse osmosis systems, 2018) for safety and water quality.
    • Transform your tap water

      Filterd and safe drinking water on demand.

      Greatwell ROG400 is a new generation reverse osmosis water filtration system, and the winner of Deutsch iF design award. Whether you have safety concerns or bad tasting tap water, the ROG400 can solve your drinking water problems. It is easy to perform DIY installation, space saving.

    • It is built to meet all of your filtration needs and removes virtually all contaminants from your drinking water far beyond EPA standards.
    • It fits the most critical user-experience requirements for residential hydration demands.
    • The system is built around precision RO technology that removes more than 1,000 different kinds of contaminants in order to provide the best home drinking water filtration available.


      • Greatwell PAC composite filter is a 3-in-1 carbon wrap filter that works as a combination of two polypropylene sediment filters and a carbon filter. By combine 3 filters in 1, a PAC filter saves more than 30% of space within the water system and filter replacement cost in long term. It is designed to remove sand, rust, chlorine, odor, and smell…etc.


      • ROG400’s RO membrane are rated at 400GPD made by GE, which provides up to 40 oz of filtered water within a minute, plus high efficiency 1.5:1 drain ration. It’s a long living work horse that removes up to 99% of over 1,000 contaminants including lead, fluoride, arsenic, hormones, asbestos, viruses and more for up to 3 years.

    • Activated Carbon filter is used to further polishes water to ensure better taste and odorless high quality H2O .

    • The lead free 304 Stainless Steel inner tube dispenses safe drinking water through the faucet. The unit can be connected to the ice maker / refrigerator.

    Highlight Features


      • Simple
        All-in-one and tank less design provides more countertop or under-sink free space. Snap-on filters and system cover provides easy filter replacement.


      • Innovative
        Built in true filter change indicator monitors each individual filter’s life.

    • Thoughtful
      Unique integrated water route design eliminates leaking concern, minimizes connectors, and simplifies installation process.


    • Availability: In Stock
    • Model: ROG400
    • Manufacturer: iSpring

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