... ,best smooth Features:PP melt blown cartridge filter uses the non-toxic and tasteless polypropylene particles ... : 10", 20", 30", 40"9)Applicable PH value:1-1310)10)Precision of filtering(micron):1,3, ... 5,10,20,30,40,50at last, there is a largest feature that our filter ... could filter more thing. the outside laryer is loose, which could make water flowing qucikly. micron filter cartridges