I've lowered my PS back sitting on the bottom of the sump. I adjusted the flow so its just an inch from the top of the skimmer cup. While watching the sump, I notice the bubbles drop down to the bottom of the up for a sec then back up to the top.
basically stays at the top for 10 secs then drops for a quick sec then back up again. hmmmmmmmmm........
any ideas what the problem is ??
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