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Thread: Pump noise only from pool

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    Pump noise only from pool

    I have noisy pump when pumping from the pool. What is odd is when pumping from the spa it's quite. Any ideas on the problem?

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    spishex's Avatar
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    Re: Pump noise only from pool

    Pumping to and from the spa, or pumping from the spa into the pool? Try pumping from the spa to the pool and see if the noise persists.

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    mas985's Avatar
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    Re: Pump noise only from pool

    Does the pressure in the filter go up when in spa mode?

    More than likely the spa has more return head loss than the pool. This tends to quite pumps some. Lower flow rates means less turbulence in the pipes. Also, higher return loss reduces suction which in turn reduces impeller noise.
    Mark
    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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    Re: Pump noise only from pool

    Yes,The the pressure in the filter go up when in spa mode more than 2x.
    Filter was just cleaned. Any ideas on making this more quite?

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    Re: Pump noise only from pool

    Quote Originally Posted by spishex
    Pumping to and from the spa, or pumping from the spa into the pool? Try pumping from the spa to the pool and see if the noise persists.
    If I pump from spa to spa... very quite, from pool to pool is noisy, if I pump from pool to spa sounds ok, but circulation in the pool is poor and less debris makes it to the skimmer.

    Any ideas on getting pump to be more quite?

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    mas985's Avatar
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    Re: Pump noise only from pool

    Quote Originally Posted by poolnewbe
    Yes,The the pressure in the filter go up when in spa mode more than 2x.
    Filter was just cleaned. Any ideas on making this more quite?
    The 2x change in filter pressure is an indication that the spa has a lot more return loss than the pool. So I suspect that the pool is running at very high flow rates. Do you see any air in the pump basket when in pool mode?

    This is a pretty common situation and can be solved in a couple of ways. You can add some head loss to the pool return but that would decrease flow rates, increase turnover time and reduce the pump efficiency. If you are ok with that, there are several ways to do this.

    1 - Replace the return eyeballs with smaller openings.
    2 - If you have a return valve which can control flow, you can restrict the return flow slightly.

    Otherwise, you might try to sheild the pump a bit better although some of the noise is probably coming from the plumbing as well.
    Mark
    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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