I have had air bubbles in the pump basket and out of the returns all summer. I checked everything I could above ground and could not find any leaks. The other day I backwashed my filter and noticed the air bubbles all went away afterwards. But the next day after the pump had shut off for the night and then turned back on the air bubbles were there again. So I shut the pump off and while it was off rotated the the multiport valve handle all the way around back to filter and turned the pump back on and the air bubbles were gone again.
I am guessing there is a dirty or bad gasket or o ring in the multiport valve and plan on taking it apart so I can check it out. If anyone has any suggestions or info that would useful please reply.
Thank you, Chad
P.S. This site is awesome I have spent many hours on this site reading and have learned alot. I am a first year pool owner and when I talk to friends and co-workers about pool chemistry they look at me and like they don't have a clue what I am talking about, and they have had pools for years.