Tri Filter Assembly, 20 inch, blue reinforced polypropylene, with brushed aluminum mounting bracket, includes (1) 20-155014-44 coarse filter cartridge to remove sediment, (1) 20-155100-43 phosphate crystal filter cartridge for limescale/calcium reduction, and (1) 20-155529-43 carbon block cartridge to improve taste/odor, recommended for machines from 1000 to 2500 lbs.