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No lights or other fittings in the pool at all. I brush the return nozzles, overflow, and bottom drain very thoroughly each time I clean the pool. I haven't run an OCLT in a few days but I will tonight. I suspect, just from checking FC each day, that the loss is going to be small. It could...

Hi all, 24,000 gallon inground, sand filter, vinyl pool. Liquid chlorine used. No other chemicals added regularly. Hardness is around 180, pH is 7.4. FC is kept between 5 - 10 during the season. Getting ready to close for the season (live in upstate NY, it's already in the 40's at night...