... & cover small area. Easy control and looks beautiful. 1. Raw water pump-- provide the pressure to silica sandfilter/ ... , most of the bacteria, and viruses into the RO membrane, The accuracy is 5um, for holding back ... the high pressure to RO membrane(at least 2.0 Mpa).7. RO system--RO system is the main part ... of pure water treatment plant. The RO membrane's desalt rate can reach as high as ...