Whirlpools are characterised with jets along the side of the bath about midway up rrncluding a suction point (similar a few colander) at a bottom base. This type of system produces hydro-massage by sucking water from the tub and pumping it among the jets privately under pressures. To increase the pressure for this jets most whirlpools possess a control on top of the bath which allows air in order to sucked into the jet water. Canister cleaners that have onboard tool storage make tools very ha...