Getting air bubbles in return jet. Will come in spurts but regular. Is that most likely a possible crack or air leak between the skimmer and filter as I do see air bubbles in filter. I only have 1 return jet. I don't seem to be losing any water and my pressure gauge is reading 14-15 as always as I am not losing any pressure. I do have a fine "dust" dirt in areas of my pool that seems to disappear when I'm in water and wave it away. I'm going to try and vacuum to waste it out and see if it reappears but should I be concerned greatly about the air bubbles if I'm not losing pressure?