... . Raw water pump-- provide the pressure to quartz sand filter/active carbon filter2. Multi-medium filter-- get rid of turbidity, ... suspended matter, organic matter, colloid, ect.3. Active Carbon filter--Remove the color, free chloride, organic matter, harmful matter, ect. ... . Micron filter--prevent any deposition of large Particles, most of the bacteria, and viruses into the RO membrane, The accuracy is ...