New pool, pump cavitating


Old 05-03-06, 08:49 AM
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New pool, pump cavitating

I am another new pool owner, in-ground.
My problem is the filter pump is cavitating when the diverter valve is installed in the skimmer. The adjustable flap on the bottom of the valve is fully open to suck from the main drains.
The only way to stop the cavitating is to remove the valve and suck only from the skimmer. Pool contractor says this is normal and will get better as the pump wears in???????????????
I think that is a bunch of BS.
Sounds to me like a restriction in the main drains.
Anybody have any ideas on how to handle this situation ?
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Old 05-03-06, 12:39 PM
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Are you filling the skimmer hose with water before hooking it up ??
Old 05-03-06, 01:01 PM
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Hose not connected, this is during normal operation.
Old 05-16-06, 08:20 PM
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Worn/damaged/ill-seated o-ring on your main pump cover allowing air to be pulled in?
Old 05-17-06, 05:27 AM
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I think it is a bunch of BS too. Do you have more than one skimmer?

The water from the skimmers is falling down into the return pipes. From the main drain it is having to pull the water up from the bottom of the pool. It puts a real load on the pump to do that. In the meantime, air is likely being sucked in from around your diverter valve, pump seals, and strainer baskets. Be sure the water line is above the skimmer or put a water hose over it with a slow stream of water.

Once it gets going you may have to dive to the bottom and take off the cover. Drop a ping pong ball into the main drain and see if it ends up in your pump skimmer. DO NOT PUT YOUR HAND OVER THE PIPE TO CHECK FOR SUCTION!

Alternatively, you can drain the level of the pool below the bottom of the skimmers and put a water hose into the pipe going to the bottom drain. Use a wash cloth to mostly seal off the hose in the pipe and start the water. You should be filling the pool from the bottom drain. If you cannot then the drain has an obstruction.
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