Carbon tanks work to remove taste, smells, odors, chemicals, chlorine, and other impurities in water. Carbon tanks loaded with carbon media come in various sizes and number; they can be plumbed in series or parallel. They can be backwashing type or non-backwashing. The backwashing can be initiated on pressure drop, time or volume of water filtered. The carbon can be a fine particle size mesh or a standard particle size. The type of carbon can be coal, coconut or wood based. It can be standard activation or catalytic with enhanced oxidation. Specifying a carbon tank system is application based.