... other impurities This material is for high quality pp string wound filter cartridge,not cheaper oneString wound filter is a ... Note: (1) filter by measuring the length of 250mm, pressure force 0.02Mpa. (2) test medium is water. (3) test ... Glass fiber Stainless steel frame 300 String wound Filter material(Filter Element,Filter Shell,Purifier,Hiross,Strainer,Screener,Filter Tank,Filter Housing)pattern 5