AUTOMATIC CHEMICAL FEEDER: Optional pool equipment that is plumbed after your pump and filter (and perhaps after a heater). A component that dispenses a certain chemical into the pool automatically. Typically, chemical feeders are limited to chlorine, bromine, or alternatives. An automatic chemical feeder that dispenses chlorine into the pool is often called a "chlorinator." An automatic chemical feeder that dispenses bromine into the pool is often called a "brominator." Regardless of the chemical that is dispensed, these automatic chemical feeders allow the pool owner to closely monitor and regulate the amount of chemical that is being dispensed. If you use chlorine or bromine, as over 90% of you do, the automatic chemical feeder is a great investment.