Hydrologic Stealth-RO300 w/Upgraded KDF 85 FilterStealth RO300 comes with an upgraded KDF 85 filter already installed. It is designed to reduce bacterial contamination from your tap water by eliminating 98% of contaminants, including chloramines, iron oxides, chlorine, and other heavy metals. It is suitable for hydroponic systems and gardening that need pure RO water. The product includes both 2: 1 and 1: 1 waste to water ratios and gives you 300 GPD pure water. In addition, it comes with a Membrane