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What is the difference between an air injector and a jet?

Jets, located throughout a spa, deliver water into the spa in different volumes and motions (hydrotherapy), which provide the body with a massaging action. Many jets are interchangeable and often adjustable so the spa bather can customize his/her soak.

Air injectors, however, are generally located in the seat areas and, when activated, create a turbulent bubbling or boiling action. The main drawbacks to air injectors is the noise of the blower, the cooling effect the large air volume will have on the water and the limited massaging action the air bubbles actually provide.