Aqua Sun Ozone 20 Years of Quality Service

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The ozone generator is not installed high enough. Be sure your ozone generator is installed above the water line.

There is no Hartford loop. Make sure there is at least one loop in tubing that goes from the ozone generator to the venturi injector.

The check valve has failed. If you have found, or can see water in the tubing above the check valve or water coming out of the air inlet your check valve needs to be replaced.