However, because of the potential for dangerous electrical shocks, whirlpool tubs should only be installed by trained plumbers and electricians. Readnower says when your whirlpool timer shuts off and the jets or the water starts cooling off, it's probably time to get out. Staying longer can be detrimental to your health. A more minor concern is bacteria in the water lines. A whirlpool tub works by pulling water from the tub through intake valves, drawing it through tubes and shooting it back out through the jets.
Bacteria can form in the water left in the pipes between baths.
Readnower suggests turning jet nozzles downward when getting out of the tub to facilitate draining. He also says running the tub through a cycle with a detergent meant for dishwashers in the water once a month helps keep pipes clean. If you have a whirlpool tub, the manufacturer can advise you on combatting bacteria. Intake valves on swimming pools create powerful suction that can injure a small child who contacts the intake. There also have been cases of people drowning when their long hair caught in an intake.