System consists of: (1) Carbon pre-filter for removal of harsh chlorine; (1) low pressure reverse osmosis membrane. This membrane does not produce as many gallons per minute as the membrane in the Tucker® 3 stage cart, but it is comparable to other membranes on the market today; (1) refillable DI filter for an ultra pure final polish of your pure water; Wrenches for opening filter housings and TDS meter for checking the water quality;