Whirlpools are characterised with jets to the side of the bath about halfway up in conjunction with a suction point (similar to some colander) with a bottom crevices. This type of system produces hydro-massage by sucking water from the tub and pumping it right out of the jets on the side under stress and strain. To increase the pressure of the jets most whirlpools have a control on the top of the bath which allows air to be sucked in to the jet water. Partners suffering sleep deprivation from...