Aladdin 27501-8 Hayward Star Clear Plus C-1750 Cartridge Filter for Pools Filter media made from 100% Spun bond Polyester for clarity, clean ability and long life Strong PVC 160 PSI core.Ideal pH Range is 7.2 - 7.8 High impact end caps with antifungal biocide added Stretch and break resistant pleat bands Made in the USA