2 pack Everpure Quick Change ADC Cartridge - This 2 pack of Everpure Quick-Change Cartridges are what some people call a Part-Timer filter cartridge because of its shorter size. It reduces unpleasant tastes and odors including those of chlorine, sulfur, iron as well as dirt, rust and sediment the same as the larger cartridge, it just doesn't last through quite as many gallons of water. With its unique space saving size it makes it easy to keep a spare around since it has an unlimited shelf life. Fits all Everpure systems that take an ADC cartridge QL2 / QL3 head dating back to 1971. 2 per package.