... sand , activated carbon, precision filter.Membrane: RO membraneHigh Pressure Pump: Water Storage Tank: 11 gallon Conformable Number: Maximum 150/200/250 ... Automatically check out the pressure of flow pipe ,produce water, supply water, pause by water overfull or lack, automatic RO membrane flushing 2 minutes ... ,etc. designed for factory ,hotel, unit the group places to supply the pure water by piping .