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Thread: Pump question

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    bluetahoe's Avatar
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    Pump question

    When I clean my strainer basket in the pump all the water in the pump,and it seems like some from the filter too, runs backward into the pool. This causes the pump to take what seems like an inordinate amount of time to prime itself.

    I can close the valves on the main drain and skimmer near the pump to stop the backward drain and then hurry and turn them back on after I start the pump.

    Is this normal, and should I install a check valve right before the pump to make it easier on myself and the pump to reprime?
    16x32 rectangular, 19,000 gal, gunite, quartzscapes plaster, Hayward Tristar 2 speed 1.5hp pump, 31" Hayward Pro Series sand filter, TF-100 test kit, BBB method rocks

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    Re: Pump question

    Could be an air leak somewhere down from the pump....you should close valves after you shut off the pump, you don't want to starve it of water.

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    mas985's Avatar
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    Re: Pump question

    If your pump (more specifically the impeller inlet) is above water level and there is no valve between the pump and the filter to shut off, a siphon is setup which will drain water out of the pump basket and then suck air into the filter displacing the water in the filter. There is nothing that can prevent this unless you have valves between the pump and filter or filter and returns.

    Also, water in the pump basket will naturally drain from the pump basket to the pool out the suction pipe, again if there is no valve.
    Mark
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    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: Pump question

    What he (Mas985) said

    BUT . . . if you have no leaks then you can shut down the pump, close the valves, clean the basket and then secure the basket cover, open the valves and then turn on the pump. That way you lose the least amount of water/prime when restarting the pump.
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    Re: Pump question

    Each setup can be complex but, assuming you have a multiport valve, try shutting off the pump, moving the multiport to the "closed" position, and then opening the pump strainer basket. May or may not work depending on your setup.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    bluetahoe's Avatar
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    Re: Pump question

    Thanks so much guys. Very helpful. I don't "think" I have an air leak. Following the steps in order as you guys mentioned I think will do the trick. Thanks again.
    16x32 rectangular, 19,000 gal, gunite, quartzscapes plaster, Hayward Tristar 2 speed 1.5hp pump, 31" Hayward Pro Series sand filter, TF-100 test kit, BBB method rocks

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