About a month or so ago, my wife turned the valve for heating the spa while the filter was running. She knows best now, but since then, we've seen a little air in the filter basket that was not there before. It was almost air tight.
I hadn't found the culprit yet, but yesterday i noticed the spa fountain was doing a little 'dancing' instead of its normal flow pattern. AND we are getting more air bubbles at several at the return jets.
I've tried running water over the filter basket lid and at the valve near the bottom of the basket. A few air bubbles at the bottom, perhaps, So, I will change out both of the basket 0-rings and see what that does.
I ran the water over all the pvc, as well, and have found nothing
Any other suggestions?