linked resource site Whirlpools are characterised with jets tubing the bath about halfway up and too a suction point (similar to be able to colander) with the bottom four corners. This type of system produces hydro-massage by sucking water from the bathtub and pumping it outside the jets on the side under pressures. To increase the pressure from the jets most whirlpools possess a control on the top of the bath which allows air turn out to be sucked throughout the jet of water. ...