OMNIFilter TO3-DS3-S06 Standard Cartridge,Pack of 2 Whole house replacement non-cellulose carbon impregnated paper cartridge Designed for fine sediment and taste & odor filtration for the whole house Reduces sediment, sand, dirt, rust particles to 10 microns along with chlorine and other tastes and odors Can be used on chlorinated or non-chlorinated water Fits OMNIFilter OB1, OB5, U25, U30 whole house filter housings and other major brands