Foggers spray a fine mist to treat large areas with insecticides, weed killers, fertilizers, parasite controls, disinfectants, cleaners, stains, and sealers. Also known as misters, they hold chemicals in their tank, pump them to their misting nozzle, and emit them in an aerosolized form. A fogger's seal material, tank construction, and other design features determine its chemical compatibility and the applications it can perform. Foggers require draining and rinsing out before storage to prevent chemicals from damaging seals and valves.