No skimmer, they are larger bubbles and come out of the return line nozzles from time to time, kind of like air is building up and getting pushed out.
I may have done a poor glue job, but in the terms of plenty of glue plus the requisite priming and twisting of the fitting to set it. If I was drawing air in it would possibly make a hissing or whistling noise or perhaps drip with the pump off; I will try that.
That's 950 at zero head, I am going up 4 feet and through a 90 and ball valve, so whatever that works out to be; I am guessing 6 or 700. I will crack the ball valve and see if a reduced flow solves the problem.
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