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Many of the chemicals you'll be using in your hot tub are simply dispensed right into the water as they are needed. However, chlorine or bromine need to be dispensed through a dispenser so they are continually added to the water without interruption. Many spa owners use bromine dispensers or "floaters" that float in the tub all the time and dispense the bromine tablets through adjustable holes in the dispenser. Open the holes for more bromine or close them for less. Some tubs also have dispensers built right into the tub near the filter. Whatever type of dispenser you choose, make sure to clean it often and check to see none of the holes are clogged.