ADC quick change part timer filter cartridges. Sold in pairs, with unique space saving size. The new Everpure Prt Timer filters give you one to go and one to stow. Reduces unpleasant tastes and odors including those of chlorine, sulfur, iron as well as dirt, rust and sediment. Recommended for use with superchlorination / dechlorination disinfecting procedure. Fits all Everpure systems requiring ADC cartridges.