ECO 122TO5S Fresh H2O Modified Carbon Block Filtration replacement cartridge with scale inhibitor. Chlorine Taste & Odor Reduction, Lime & Scale Reduction. Features a gradient depth carbon block for maximum dirt holding capacity and particulate reduction, with minimal pressure drop across the filter element. Use as pre-treatment for commercial Fountain, Ice, Beverage and Food Service equipment. (Sometimes called 122T05S, 122TO5-S ) 20,000 gallon capacity, 5.0 Micron Nominal Particulate Reduction, Flow Rate 2.5 GPM For use in the following MF systems: MOD-10422, MOD-20422, MOD-30422, MOD-40422, ECO-10422, ECO-20422, ECO-30422, ECO-40422.