Guangzhou Lvyuan string wound filter cartridge is made of texile fiber (polypropylene string, Absorbent cotton string, acrylic fibre yarn, fiberglass), according to the specified process, it is winded tightly with the string in the polyporous core, structured by loose outer layers and tight inner layers, the filter cartridge porous outside it is big, inside it is small, it has the true deep filtration effect,it can remove the suspension, rust, partricles etc.