1.Fiberglass filter tank 2.6 way multi-port valve 3.Oil ... Uniquely designed distribution makes a stable and even water flow to improve drainage system. 4. Working pressure is 2.5 kgf/cm2 ... public pool ,water amusement park , seawater , freshwater breed aquatics, industrial and drinking water treatment , pre-treatment of groundwater , well water , spring water and drinking water . Sand Filter Pool