Tennis balls ? in skimmer

Jun 16, 2016
573
Quogue new york
I don’t have algae but getting this black sticky ring in my skimmer. Is that pollen? I remember using tennis balls, will that work ? I was going to order oil pads but they were $20 for 2. After ordering $75 in those new skim a round baskets. Waste of money. Then $38 on 2 sprinkles you put on return jets. They don’t work they pop off.
 
The black ring in the skimmer is normally lotions, sunscreens, body oils, etc that create a 'scum' ring.

Tennis balls work. They sell scum balls too --
 
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