Could just be dust or something like that. One of my skimmers is particularly prone to that, in that skimmer's case it's a combination of a higher air flow through a 1/4" line so the air velocity is higher than that on other skimmers and thus I have to give the intake a clean when I clean the rest of the skimmer about once a week.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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