Compatible Replacement: This 1 Micron 20 x 2.5 whole house carbon and polyphosphate water softening filter fits most 20 inch water filter housings. High Quality Filtration: The high capacity water filter is able to achieve filtration down to 1 microns improving water quality, at a flow rate of 2.5 GPM, reducing chlorine taste & odor, hard scale, and particles. 6 Month Filter Life: Depending on the quality of your water, replacing your home water filter cartridge every 6 months is recommended for the average household to ensure optimal performance. Durable Materials and Design: Tier1 products undergo strict quality assurance testing and are manufactured using the highest quality materials. Quick & Easy Installation: Simple and easy universal fit into your 20 x 2.5 Inch whole house water filter system.