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Two more jets are located on each of the bench seats, and they focus the water massage on your lower or middle back. The spa also features an ozone jet (C) which is part of the built-in ozone generator system. Ozone helps sanitize your spa with minimal chemical treatment. The suction vents (D) located near the floor of the spa brings the water into the pump in order to operate the system. The suction covers should always be in place over the suction vents. Never operate the spa without the sucti