Designed to be used with U.1106 and U.1408 hot water filtration system High quality filter cartridge removes chemicals and other contaminants Reduces particulates, chlorine taste and odor for clean tasting water Scale reduction media to protect Hot Water Tank A replacement water filter cartridge compatible with Rohl Perrin & Rowe U.PRF1. Designed for use with U.1106 and U.1408 hot water filtration systems. Recommend changing filter every 6 months or 1,000 gallons/3785 liters. 1 filter per packet. Compatible with the following systems: U.1323, U.1307, U.1347, G1445, G7545, MB7945, G1655, U.1106, U.1833, U.SB72D1LM