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    Pump on, Hayward heater off but still noisy.

    Thank you for your recommendations. If I have an air leak, should I see water dripping at leak source? The pool jets are not blowing air bubbles. When I remove the header at the heater, will I need to replace gaskets or is it a reusable? The task looks pretty simple. Is it?
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    Pump on, Hayward heater off but still noisy.

    With filter pump running but the Hayward H400 heater off a considerable water noise is heard at the heater header. This header noise just started after 13 years of use. It is not steam as the heater is off. I have a video so the sound can be heard but couldn't figure out how to attach it to this...