Watts Permeate Pump, GTS Series Standard Cartridge Systems are residential reverse osmosis systems. They use industry standard cartridges and have a proven design (no label model), 50 gpd or greater thin film membrane (made in USA), high flow faucet plumbing (3/8 post filter and 3/8 tubing to faucet), clog free brine flow control, Quick-Connect fittings on inlet and outlet ports, and included installation kit. Permeate pump uses no electricity and provides more water in storage tank, better contaminant reduction, and faster tank filling, and reduces waste water by 400%. Inlet water fitting is adaptable to use with 3/8 compression or 1/2 compression fittings. Many faucet options are available. Metal or plastic tank options are available.