The filtration raw material ofthe polypropylene pleated flter cartridgeis ultra-fine polypropylene, which has an all-polypropylene structureand adopis the fiber depth filtration technology of gradual pore size toimprove the dirt holding capacity and avoid the surface clogging oftheflter clement, The upstream pore size of the filter clement is coarserand the downstream fow is finer, which can finely classify andintercept particles and prolong the service life.