I'm new to TFP and have enjoyed it's wisdom and advice. I hope somebody can help me with a problem that has recently developed in our pool. There are small air bubbles coming from the return line into the pool. I've checked all of the fittings and connections from the skimmer, through the pump and filter, and haven't found anything loose that might be sucking air. There aren't a lot of bubbles, but there weren't any just last week. Any suggestions would be greatly appreciated.