The pure water treatment process depends on the quality of raw water. If the raw water is municipal tap water, the general process is sand filtration – activated carbon filter – softening (optional) – security/cartridge filter – reverse osmosis – ultraviolet disinfection – water production. In the case of general surface water, sterilize and add flocculant before entering the above process. If it is well water, add iron and manganese filter after sand filtration.