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Oops, just noticed: when timer turned off pool pump, bubbles stop bubbling. Does that indicate problem with air in pool pump or still could be air in solar heating system?

My brother noticed a steady stream of bubbles coming out of the holes in the sides of the pool where the solar system water normally enters the pool (there's probably a technical term for them but I don't know it) and told me it looked like there was air in my pool system. As he is younger than...