circulators are these devices that screw into your returns and go round and and sweep the return water across the bottom and sides of the pool. keeps the dirt off the floor and sides.

The return water is basically operating them.

My concern is why when the pressure gauge runs at 30 to 32 the air stream stops when all three valves are open.

When i reinstall the eyeball diverters the pressure goes to 22 and all this air returns in the pot strainer and out the returns. I have to close the main half way and one skimmer half way. There is a crackling noise in the multi port valve when all of this air is coming thru.

I replaced all o rings tightened all connections..could it be in the multiport valve..it is a sta rite