The indicator ball doesn’t stay in the center of flowmeter.

The flowmeter provided is a general tool to setup flow to the ozone generator. Flow will vary depending on pressures across the injector, and therefore can be affected by things such as filter or strainer loading. The ozone generator’s efficiency is optimized near the center of the flow meter. The DEL Ozone generator will still perform well at flows above and below the recommended range; however, the ball must be moving and not stuck on the bottom of the flowmeter.