FILAD SPS Filter-Protection before water tower, different from other plastic filtration equipment on the market, is all made of stainless steel. SPS Filter-Protection before water tower is non-consumables with built-in European SUS316L stainless steel wedge wire screen. It is manufactured with great precision and is high pressure-withstanding and wear-resistant. It can be used permanently on condition that you remove the impurities off the surface of the screen regularly. With an absolute filter rating of 80µm, it effectively prevents rust, sand, suspended solids and other impurities from entering the water towers, tapwater storage tanks and household water pipes, from blocking the pipes and causing corrosive damage.