CBC-20 Pentek Comparable Water Filter Cartridge by Tier1A CBC 20 Pentek comparable, the CBC 20 Tier1 is designed to help ensure you serve only high quality water throughout your home. The CBC 20 Tier1 water filter cartridge helps to capture sediment and dirt as small as 0. 5 micron in size. Installs quickly and easily into systems that accept 20 x 2. 5 inch filter cartridges. Get the filter you need to reduce even the smallest dirt and sediment particles by ordering the CBC 20 WF Tier1 water filter