String wound filter cartridge is made by tightly winding high-quality fiber materials, such as polypropylene or cotton yarn, around a porous core to create a deep filtration structure.
Automatic Back-Fhushing Filter has metal back flushing filter cartridges inside. When filter elements clogged, a specially designed back-flushing anm will clean the elements one by one. When filtering. the water enters the element fiom both ends.
