The KRPLUS CTO Filter 20″x2.5″ Carbon Block filters reduce chlorine, taste, and odors effectively. Superior construction provides cleaner, safer water. Carbon blocks are superior to granular carbon, as it does not develop flow channels for water to pass through. Carbon blocks also maximize depth filtration(the thickness of filter media the water passes through) and adsorption (the surface area the water encounters as it travels through the filter). The Carbon block is designed to filter levels of chlorine and other chemicals from the incoming water. Ideal for reverse osmosis pre-filtration, water fed pole systems, fish keeping filters dechlorination, and more. Carbon Block water filter cartridge provide your home/office to pure, healthy and clean water and after using this Activated Carbon Block filter all contamination from your water are eliminates. Quick & Easy Installation: Fits most Housings that accepts standard 20-inch x 2.5-inch water filter cartridges.