hmmm..interesting..i hope poolsean will stop by with some thoughts...sounds like pretty much exactly what happened to me. now, this may "burst your bubble", (bad joke, i know) but my cell was inside all winter (i have a pvc piece with unions on each end that goes where the manifold goes until i have the pool pretty close to cleaned right up. i simply attributed it if not something else with my pool, to the high output level i accidentally ran. i certainly am not thrilled at the idea of having a bunch of bubbles every time i want to use my pool..we'll see how it goes tomorrow..i'm running my heater starting at 3am until i get home so it's swim ready and i'll be leaving the autopilot off but i don't anticipate any problems..just not as much fun or nice to look at a pool with what appears to be a bunch of white scum all over the place (and i can confirm it definitely was coming from the returns and the autopilot. the water was quite clear as it the cloud started to come out and it very quick turned into clusters of very tiny bubbles all over the place and it was coming from both returns. like i said, it stopped almost immediately when i shut off the autopilot. for reference, i'm running the soft touch version. it occurred to me to take off the top part and check that filter thing in there that looks like a tea bag holder, but given my flow is fine and it's downstream from my heater, i can't believe there would be any issue there.