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Thread: Can the pump cavitate?

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    Can the pump cavitate?

    Hello, I replace the 3 of my old valves this spring that were leaking air pretty bad. Now the new issue is that if I move the valve to pull water from the skimmers (2) only seems the pump starts to cavitate, but if i move the valve to pull the water from the main drain there is no issue. When I initially discovered this I though a possible air leak in the system but no air is being pulled into the pump basket.
    Has anyone experienced this issue ?
    37k gallon free form with spa, 2HP challenger pump, Rheem heater, maters in floor cleaning, Polaris 480.

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    Richard320's Avatar
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    Re: Can the pump cavitate?

    Welcome!

    You either have a restriction in the skimmer line or an air leak. Check the water level and the weir (flapper). If you look into the skimmer when it's happening, do you see a whirlpool/tornado in there?
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    mas985's Avatar
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    Re: Can the pump cavitate?

    Also, what makes you think the pump is cavitating? What are the pump symptoms?
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Can the pump cavitate?

    Thanks for the responses , when i move the valve to 100% skimmer there is no water vortex/ tornado though rapid water movement over the flap. The water level is actually a little on the high side.

    The pump symptoms are the pitch/ noise of the pump change to a high whine similar to the sound when the pump is priming. No air can be seen in the pump basket lid, and the pressure on the filter drops from about 17 psi to 10 psi. The filter is a 72 sq ft. Nautilus SS.
    37k gallon free form with spa, 2HP challenger pump, Rheem heater, maters in floor cleaning, Polaris 480.

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    Richard320's Avatar
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    Re: Can the pump cavitate?

    Quote Originally Posted by spongeleg
    Thanks for the responses , when i move the valve to 100% skimmer there is no water vortex/ tornado though rapid water movement over the flap. The water level is actually a little on the high side.

    The pump symptoms are the pitch/ noise of the pump change to a high whine similar to the sound when the pump is priming. No air can be seen in the pump basket lid, and the pressure on the filter drops from about 17 psi to 10 psi. The filter is a 72 sq ft. Nautilus SS.
    It's starving. I get that when I vacuum. The hose is just to small to feed the pump.

    Any chance one of those new valves isn't opening 100%? No rocks got in the pipe while it was open?
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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