... %Pretreatment: Quartz sand , activated carbon, precision filter.Membrane: RO membraneHigh Pressure Pump:Water Storage Tank: 11 gallonConformable Number: Maximum ... supply water, pause by water overfull or lack, automatic RO membrane flushing 2 minutes each hour ,force pretreatment back ... wash ,etc. designed for factory ,hotel, unit the group places to supply the pure water by piping ...