I find that sometimes, a vortex happens in the skimmer and air gets pulled in along side the water.
Was doing some maintenance on the pool yesterday and noticed this again, usually it happens when your water is on the low side and there's less spillover into the skimmer, however, my water level is relatively high right now but I'm not running the basket in the skimmer at the moment which is the reason the vortex is allowed to pass air right down into the intake hose - might want to look at that before anything else.

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