Spun PP water filter cartridge is made of melted 100% ... 100% food grade polypropylene.Comparing with PP string filter cartridge,it has better chemical durability and longer ... available for your choice. Spun/melt blown PP filter cartridge molded SpringFeatureReplaces metal assemblies Provides more positive seal ... PP ( Polypropylene core ) C. Micron Rating: 1,5,10,20,25,50,100 D. The Length: Up to 125mm ...