This is So-Clear General Purpose Carbon Water Filter Cartridge, 20 inches. It is an exceptionally good chemical compatibility and excellent resistance to micro-organisms. It removes dust, rust, silt, grease, organic acids, oils, concetrated alkalis, organic solvents, electro plating solutions and other unwanted sediments. It is also exceptionally good in removing odour, taste, oils, organic acid, etc from the water. It is a 0.5- Micron filters remove dirt, debris, and even microscopic particles from water. A micron is one-millionth of a meter or one twenty-five thousandth of an inch. This filter cartridge is a 0.5-micron filter, thus removes particles as small as 0.5 microns. This filter cartridge is removed periodically for cleaning, and ideal to replace within 4 to 6 months of usage. This Carbon Water Filter Cartridge have an exceptionally good chemical compatibility and excellent resistance to micro-organisms and It is suitable for residential, industrial, as well as for commercial purposes and applications. It is a general/multi-purpose sediment removal such as dust, rust, silt, scale, etc. Its ideal applications include water, organic acid, concentrated alkalis, organic solvents, and electro plating solutions. This sediment water filter cartridges is 52*6cm (20" length), suitable for all 20" water filteration housing.