Hi: Solar heated salt water in-ground pool. Opened in May 2010. When the solar is turned on, you see an inordinate amount of gurgling (bubbles) coming mostly from the return below the skimmer. (some bubbling occurs at the return near the steps at the other end of the pool.) The Cuddy red lights comes on and goes off almost in sync with increased then decreased water flow. The filter basket next to the pump usually is so full you can’t tell there is water inside when the pump is running, now there appears to be an air bubble. We cleaned the main filters twice recently. The solar doesn’t seem to be heating as quickly either and it seems as if the water pressure coming from the vents below the skimmer is slower than normal??