The CTOS-20B is a 4.5” x 20” Drop-In cartridge that reduces sediment down to 0.5-microns and reduces chlorine, taste & odor at a flow rate of 5.0 gpm for 50,000-gallons. The cartridge includes IsoNet®, OptiPure’s patented scale-inhibiting technology, which delivers consistent protection against the precipitation and accumulation of scale and provides a protective barrier to help guard against corrosion.