... size, making it easy to be cleaned, the back-flush strength is 12-20 l/m2, ... distributed,easily packed,uneasy to wash away,none secondary pollution,it is applicable for ion exchange, ... valveless filter chamber, reverse osmosis system. It is usually pretreatment or supporting layer in reverse osmosis ... processing, the porcelain sand filter material is able to free from iron, Mn, fluorine.For more details ...