Mark,
That's REALLY interesting that one of your returns doesn't bubble at all. I assume all three are coming from the output of your SWG, right? You don't have any sort of bypass of flow with some going around your SWG to one return, right?
If the SWG output is going to all three returns, then is the one return with no visible bubbles at a farther distance away from your SWG? If so, then the theory of the chlorine bubbles needing more time to dissolve may very well be on the right track.
I would think that a pool cover would keep the chlorine in contact with the water longer so that it would eventually dissolve and not escape, but I suppose we'll find out.
I'm looking forward to the results of your experiment. Thanks!
Richard
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