... multi-medium quartz sand filters, main purpose is to remove the water contains sediment, manganese, rust, colloid material, mechanical impurities, ... (Carbon filter)Activated carbon filters used to remove the pigment in the water, smell, a large number of chemical and biological ... 2.Low pressure protection 3.High pressure protection 4.Tank level control 5.Manual/Stop/Auto switches 6.Backwash & ...