Product Description 10 20 Inch Big Blue UDF GAC Activated Carbon Block Water Filter Cartridge GASKET: Food Grade PVC Material; With good sealing, the filter is more. Carbon: Provided by Jacobi Brand, one of the best activated carbon brand. IV > 1100 Housing: Eco-Friendly, health and no second pollution. Filter fine filter < 5 micron Filter core life (3-6 months) GAC Water Filter Cartridge Applications: (mainly for clarifying liquid and get rid of peculiar smell) Filtration for alcoholic drink to make it cleaner and less alchol Filtration for organic solvent to take away the pigment Filtration for water treatment to take away the chlorine,pigment and peculiar smell