To winterize your Coleman hot tub, turn off electrical power, drain the spa and hoses, and open unions while removing drain plugs. Introduce RV antifreezeRecreational vehicle antifreeze is non-toxic and designed for use in the plumbing systems of cars (but it can also be used for hot tubs). Usually comes in pink color. with an inhibitor if needed. Drain and clean the filter, ensure no water is in the heater element chamber, and cover the spa with a water-shedding, impenetrable cover to guard against freezing and maintain longevity.