... 5 With PP core Introduction:(with PP core)String wound filter cartridge is made of the textile fabric ... food and beverage, wine, ect. Performance specifications: Product Wire string filter cartridgeMaterialPolypropylene,absorbent cotton, glass fibrePrecision filtration1~100micronOuter diametr60~62mmInner ... softener, UF water purifier, RO system water equipment ect. nylon string wound filter cartridge