The Vevor whole house water filter replacement cartridge uses a CTO activated carbon block to help reduce chlorine, odors, impurities, and unpleasant taste in household water. Its standard 4.5" x 20" size is designed to fit most compatible filter housings and whole house water filtration systems. The high-density carbon block provides up to 5-micron filtration and supports water flow for whole-home use. Each set includes two cartridges with a service life of 9 to 12 months depending on water quality. This replacement set is suited for maintaining cleaner, fresher water throughout the home.