... Description Feature:Pure Water Production Capacity: 300GDP/400GDP/500GDP Desalting Rate: 98%Pretreatment: Quartz sand , activated carbon, precision filter.Membrane: RO membraneHigh ... water, supply water, pause by water overfull or lack, automatic RO membrane flushing 2 minutes each hour ,force pretreatment back wash ... for factory ,hotel, unit the group places to supply the pure water by piping .