Spun PP water filter cartridge is made of melted 100% food ... 100% food grade polypropylene.Comparing with PP string filter cartridge,it has better chemical durability and longer service ... more positive seal, eliminates bypass Easy, quick changeout Spun PP filter cartridge molded SpringModel: UNPPS-(A)-(B)-(C)-(D ... PP ( Polypropylene core ) C. Micron Rating: 1,5,10,20,25,50,100 D. The Length: Up to 125mm ...