These five stage reverse osmosis systems fit nicely under a kitchen sink providing great tasting water for the whole family. Filtration stages include a sediment filter for dirt, rust and other sediment contaminants, and two carbon block pre-filters to reduces chlorine, taste and odor. 50 GPD reverse osmosis membrane, which is the heart of the RO system, filters out particles as small as 1/10,000 of a micron and a final stage polishing filter for fresh tasting water every time. This RO system comes complete with quick connect fittings for easy installation, a 3 gallon water storage tank and a non air gap reverse osmosis faucet. Recommended inlet water pressure is 40 psi with maximum water hardness of 15 GPG.