The surface of the pool is all foamy from these air bubbles. I can see them in the pump...and you can actually see the water / air stream blowing into the pool from the return lines. I already have a problem with the water being the wrong color (green) rather than blue, so maybe the two problems are related in some way. I read a few threads here about this bubble problem and it suggests checking around the pump - o-rings and gaskets, etc. Should I pour some water over the pump to see if I can tell where there might be an air leak? Any advice appreciated. I'm frustrated enough as it is because of the color problem.