I have an air leak that is very small and hard to find. After leaving my pool off for 14 hours over the night, I start the pump. There is no air in my basket strainer and the pump is primed and ready to go, so no on the suction side leak. There is no water on my dry cement under any pipes, pumps, or filter. After starting the pump, I look in the pool, and about 1/4 air and 3/4 water come out of my returns lines for about 1-2 seconds then stop completely for the remaining 10 hours of operations. I do notice a few air bubbles coming from my Polaris hook up in the middle of the pool but it is very inconsistent but does continue through out the day and by air leak i mean the smallest smallest bubbles you wouldn't see unless you were looking for them. I have a salt water pool and I know they create bubbles but not to this extent. This started happening about two weeks ago and has not gotten worse but it just annoys me that their is an air leak I cant find it. I'm thinking it must be the filter even though my filter gauge is rock steady or something having to do with my Polaris pump but there is no water anywhere in plain view. Also when I turn the pump on I think i hear the air getting flushed from the piping but cant figure out if it is before or after the filter. If you can help me figure this out it would be great. My buddy who has had a pool for years longer than me says I will never find it without replacing everything and just wait until it gets bad enough to where it is easier to pin point. Any thoughts from the pool pros. One more thing, I am not losing any water at all from the pool.