... to aftersale maintenance, 1 year's warranty Typical process flowRaw water Pump + Multi-Medium Filter (Quartz Sand Filter + Activated ... -medium quartz sand filters, main purpose is to remove the water contains sediment, manganese, rust, colloid material, mechanical impurities, ... out organic material, adsorption of residual chlorine in the water, using water more than less than or equal to chlorine 0. ...