Just tightened all the suction side. Some were loose a little. Used a filter wrench to just snug. No more bubbles, sand filter now super quite - no more creek sound 👍🇨🇦

Thank you

We were having same issue there was no leaks anywhere or no air leaks,but I check are valve gasket and there was a very small nick right by the oil ring . You barely could see it ,but that was the problem.

We have an inground swimming pool and I’m having air bubbles in my return lines in our pool…..could the reason be our skimmer face plate because two screws at the top are rusted pretty bad and it has rust at the bottom….but I’m not losing water at the skimmer…..I checked the O ring and put magic lube on it really good……I have a Hayward Super Pump