About 6 weeks ago I cleaned the black scum off of the insides of the skimmer basket, had surgery and now I’m back outside caring for the pool and noticed that the scum has reappeared. No one has used the pool in the last 6 weeks as I’m trying to let the water temp drift down to 60 for closing. What is this stuff? Is it normal? It’s greasy. Comes off easily with Comet with bleach.
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