How can I describe where on earth nouns is entering my pool filtration system? There is air coming our of the return pipes of my inground...

There is air coming our of the return pipes of my inground concrete pool I hold checked the pump and fittings. Is there a biddable way to check PVC joind for nouns leaks? Whats the best bearing to test the undamaged filtration system?
How can I stop hose from leak into...
Answers:    There are a lot of plumbing companies that immediately have a camera that they slide up through the pipes to check for cracks or collective separations. They are pretty common presently so the price to inspect your pipes has come down comparatively a bit. Some companies will even do it for free if they get to bid the repairs.
It's the best opening because even if you did a pressure check all it would confirm is that you own a leak, not where on earth it's located.