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Thread: Cavitation

  1. Back To Top    #1

    Join Date
    Dec 2015
    Danville Ca


    I have problem with the pump cavitation . I have checked for suction leaks and had a leak detection company out to test and they have found no leaks.I have snaked the suction line from the skimmer back to the pump. Blown the line out with water pressure and air. Replaced pump lid gasket and replaced impeller on pump. Running out of ideas. Next step is to run a temporary line from the suction side of the pump directly into the pool to see if the problem disappears. When pump is running can see lot of bubbles thru lid on pump and have to bleed filter of air every 30 minutes. Problem started out of the blue. No resent changes were make to pool equipment. May try to install filer cartridges but I have a feeling this wont help. Running out ideas.If anybody has experienced this problem and resolved it please let me know what you did.

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    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Cavitation

    Welcome to the forum.

    I doubt your pump is cavitating as that occurs only under some extreme conditions.

    I do believe you have a suction side leak and have just not found it yet. The most common place is the pump basket lid and the O-ring that seals it. Have you read the article in Pool School on suction leaks? It may help.

    Are the drain plugs at the bottom of the pump screwed in snugly (but not over-tight?)

    Once you are sure the pump is sealed, you just keep working back towards the skimmer checking absolutely every possibility for a suction leak.

    It is also possible for your pool water level to be too low and the suction leak will be the skimmer sucking air.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    JoyfulNoise's Avatar
    Join Date
    May 2015
    Tucson, AZ

    Re: Cavitation

    Can you please list your pool equipment in your signature. It's hard to help diagnose a problem if we have no idea what type of pump you have or your filter type/size.

    Please read the Read This BEFORE You Post article in Pool School
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

  4. Back To Top    #4
    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: Cavitation

    When pump is running can see lot of bubbles thru lid on pump and have to bleed filter of air every 30 minutes.
    That does NOT mean you have cavitation. You only get that with an air leak. Cavitation can only be heard and not seen in a pool pump.
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

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