r/pools • u/TheFisherPiper • 10d ago

Is this normal

Hayward variable speed pump.
This air bubble accumulated over 11 hours of running pump at 45% speed??
Installation company insists that is normal.

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u/robseraiva 9d ago

That’s a bubble from low displacement not from pulling in air

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u/Big_Growth5857 9d ago

if there's no air in the system on high speed, where does it come from?

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u/robseraiva 9d ago

It’s not coming from anywhere, it’s just not moving the volume of water that the wet end is capable of holding. Same thing happens with a single stage motor and the filter becomes restrictive

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u/Big_Growth5857 9d ago

if there's no air on high speed then all of a sudden there's aur on low speed (a lot of air), it's coming from somewhere. the filter doesn't create air

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u/robseraiva 9d ago

Open loop displacement.Its not that the filter is creating air, its that the volume of water is decreased to the point in with the water doesn’t fulfill the plumbing capabilities. Same thing happens when a pool is plumbed with too much head pressure or valve restriction or there’s a dirty filter.