OMNIFilter's RS1 whole house pleated cartridges are used for the reduction of sand, dirt, sediment and rust particles. Help to protect your plumbing and appliances from getting plugged with sediment, causing costly repairs. They are a cost effective solution for homes with sediment problems and can be used on chlorinated or non chlorinated water supplies. | Pentair Rs1-Ds12-05 20 Micron Filter Cartridge