Air Gets in VS Pump when on Low RPMs


Gold Supporter
Jul 17, 2016
My Hayward VS pump is set to come on and run for 6 hours on 50% power and then 6 hours on 80% power. When the pump first comes on, it goes into prime mode before switching to 50% power. When it originally starts up on 50% power the pump will acquire an approximate 3 inch diameter air bubble before it kicks into 80% 6 hours later. Once at 80% the air is cleared out of the pump.

Is this normal for air to start collecting in a VS pump when running at a low speed? Is this anything for me to worry about since this is a brand new pool?

Like I said, when the pump kicks up in speed or originally primes, there are no air bubbles present.


Silver Supporter
Bronze Supporter
Jan 28, 2021
Charlotte, NC
Pool Size
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
Holydoc, I have an older pool with a new VS pump - it does the same thing. I get some bubbles in the clear window when it is running at 1,800 RPM. I have mine increase to 2,450 RPM for two hours in the AM and then again for two hours in the evening, which clears the bubbles. In my case, I am sure it they are caused by a slight leak in the multiport valve on the filter. (I haven't gotten around to changing the gasket, I will soon...) The higher speed periods push the bubbles out, so I haven't worried about it. I am interested to hear from more knowledgeable people than me on this topic...
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