Fits Greatwell ROG400 RO system. Package includes one 400 GPD RO membrane that works efficiently with a 1.5:1 pure to drain ratio. It removes up to 99% of over 1,000 contaminants including lead, fluoride, arsenic, hormones, asbestos and more, and lasts for up to 3 years. Snap-on RO membrane provides easy filter replacement. It is recommended to be replaced every 2 to 3 years depending on the water quality and usage. The RO membrane of ROG400 is made by GE and rated at 400GPD, which provides up to 40 oz of purified water within a minute, along with a high efficiency 1.5:1 pure-to-drain ratio. It’s a long-living workhorse that removes up to 99% of over 1,000 contaminants including lead, fluoride, arsenic, hormones, asbestos and more for up to 3 years.