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Thread: Pump not priming to waste

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    Join Date
    Jun 2016
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    Louisville/KY
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    Pump not priming to waste

    My pool pump will not prime when set to waste. It primes with no issue when set to filter. I changed my sand and multi port valve today but that did not fix my issue. Does anyone here know a solution or anything else I could try? I'm at a loss at this point!!!

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    bdavis466's Avatar
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    Aug 2014
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    Riverside, CA
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    Re: Pump not priming to waste

    There might not be enough restriction on the discharge side of the pump and it is cavitating while trying to prime. Do you have a valve on the waste side you can partially close to restrict the flow until the pump primes? With no restriction and smaller diameter lines on the suction side, it would be fairly easy for the pump to run away from itself.
    -Brian-
    33K Pool/Spa, Pentair Equipment
    POOL BUILD
    Davis Custom Construction - Home Page

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    Jun 2016
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    Louisville/KY
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    Re: Pump not priming to waste

    Thank you Brian. My lines are the same size. So I don't know if that's the issue but I will try restricting the flow on the waste side.

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    mas985's Avatar
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    May 2007
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    11,485

    Re: Pump not priming to waste

    Why are you trying to prime on waste?
    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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