Poly Spun Sediment Filter – 20 Micron (Nominal) Size: 10″ x 2.5″ St&ard Size Cartridge. Suitable for all town water usage. Constructed from polypropylene which is spun. There is no centre core to restrict filter performance. These filters are compatible with most liquids & are highly effective for sediment, rust, s&, silt, & algae removal. The filters have no chemical residuals. Carry a heavy load of sediment – Longer Life. We use these filters over others due to high performance, high flow rate, high load capacity, & their inability to grow bacterial slime.