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When I turn my pump on every morning and the SWG powers up, there is a large "clunk" noise from the controller. Is this normal?

I have the same issue, except my instant salt readings alternate between -2000 and -100, even though the salt concentration is 3400, as measured independently by my pool technician. Since the cell is 10 years old (only runs 4 months per year/12 hours per day at 30%), I am assuming it needs...