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Anyone know how to test a Compool 3800 TS-5L temperature sensor? Are they resistive, and what would nominal resistance be at 60-70F? I'm getting an intermittent dreaded "Err1" on the Compool, and sometimes erratic temperature reports. I suspect the problem is the wiring between the controller...

I need help diagnosing a staining problem in a plaster pool. First, more information about the pool. I hope this isn't too long winded, but I'd rather not have a long series of follow up questions because I left something out. Bear with me... It is an approximately 10 year old 20' x 40'...