Variable speed pool pump

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Last Post 13 November 2020
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Edward posted this 04 November 2020

Bought a new variable speed pool pump. Plumbed it in and had bubbles in return, assumed a leak in plumbing and so totally re-plumbed it. Still have some bubbles Watched it more carefully and only have bubbles in return on low speed. What could be happening?

Details:

On low speed:

Visible bubbles in only one of the two returns in pool.

Small but visible bubbles in chlorinator.

No bubbles visible in pump basket, full of water.

On high speed: no bubbles visible.

Could it be a problem with the pump?

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InyoRob posted this 04 November 2020 - Last edited 04 November 2020

Small amounts of air in the system is common with variable speed pumps running on low speeds. You can try lubricating the lid o-ring with a silicone or teflon lubricant. It could be a case where a small amount of air is getting in through the lid. This may not happen on high speeds because of the increased pressure on the lid/o-ring.

If the pump is not losing prime overnight, I wouldn't worry about it.

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Edward posted this 12 November 2020

Thanks Rob for your quick response. Lubricated oring and lid no change. But have watched it over the past week and small bubbles on slow speed continued. No problem with keeping prime and only a small amount of air in system when off. So, I am not going to worry about it Saves a lot of electricity. Thanks