Thin Layer Composite (TLC) Permeate Check Valve Encapsulated Membrane Style Flow Rate: 75 Gallons Per Day Dimensions: 15.14" X 2.5" Replace every 24 months 1/4" Quick Connect Fittings Rejection Rate: 0.96 The 4002575 GRO-75EN High Efficiency is an innovative next-generation RO Membrane using Thin Layer Composite technology (TLC) to provide enhanced water recovery in an encapsulated membrane. Where traditional RO membranes have a 3:1 ratio of 3 gallons of waste water to every gallon of purified water, the GRO-36EN new technology allows for a 1:1 ratio of 1 gallon of waste water to every gallon of purified water; making it more water and energy efficient. Less waste water down the drain for the same amount of purified water means saving you money and the environment with the same great results! The 4002575 GRO-75EN model RO membrane includes a premeate check valve, a 96% rejection rate, 1/4" quick connect fittings and is 2.5 inches wide by 15.14" inches long with a production rate of 75 gallons per day.