The  Inspiration is a closed circuit system which means that the breathing gas is continuously recycled in a closed loop. This is in contrast to conventional open circuit diving in which the bulk of the exhaled breath is wasted by venting it out into the surrounding water.
The exhaled air is directed into  a scrubber filter which absorbs the carbon dioxide before entering a mixing chamber where 3 individual oxygen sensors measure the partial pressure of oxygen (ppO2). The electronic controller  automatically instructs the solenoid to inject oxygen into the mix to replenish the oxygen the diver has metabolized and maintain the ppO2 at the chosen Set Point. The replenished breathing mix passes into the inhalation side to repeat the cycle.

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