How does XF-S4 work: the filtered liquid is from up to down through the filter tubes and from inside to outside through the filter screen in order to improve the filtering efficiency. This unique design adopted clean dish by a tight spring, which can be up and down continuously within the filter medium to remove the deposition of dirt and clean dish will continue to keep sol id impur i t ies to the downst ream, and was concentrated in sewage for discharge. In the middle of the system is equipped with a strong internal piston and the hollow shaft of magnets. The inside magnet and the outside magnet is encapsulated in a carrier coupling together and carrier connection with clean dish.