Teachingbd 24 Whirlpools are characterised with jets on the side of the bath about midway up and a suction point (similar a few colander) with the bottom corners. This type of system produces hydro-massage by sucking water from the bath and pumping it among the jets on the side under blood pressure. To increase the pressure for this jets most whirlpools possess a control on the top of the bath which allows air to become sucked in to the jet water. ...