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Thread: Any potential problem using two pumps?

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    Mar 2011
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    Clearwater, FL
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    Any potential problem using two pumps?

    Over the next few days I plan to set up a second pump for a solar panel. I want to T off before the sand filter and use a small cartridge filter pump to push water through the solar panels and then enter back in a second T after the sand filter.

    Is ther any problem with potential water pressure on the return side of the sand filter?
    21K gal kidney shape in-ground pool
    Hayward C1200 filter
    Single speed pump

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    duraleigh's Avatar
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    Re: Any potential problem using two pumps?

    I may very well be wrong but I am not sure that will help. Pool pumps are constant speed pumps and if they are being force-fed like you are discussing, I'm not sure it will do any additional work.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Any potential problem using two pumps?

    The pumps are not in-line, just using the same intake and return lines.
    21K gal kidney shape in-ground pool
    Hayward C1200 filter
    Single speed pump

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    York Pennsylvania
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    Any potential problem using two pumps?

    You may end up robbing water from your main pump causing it to cavitate or get air bound. May need some valves to meter water to both better. May not work at all. I'm curious to know though
    Dave S
    24x52" Round AGP
    Hayward S244T 300 pound sand 1 HP matrix pump
    Taylor K-2005 Test kit with the K-1515-A FAS-DPD added on.
    No one is useless, you can always serve as a bad example!

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    mas985's Avatar
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    Re: Any potential problem using two pumps?

    Why would you want to do that? Unless the main pump is a very small AG pump, it should handle the solar panel just fine by itself at much less energy use. Using two pumps would just waste energy without much benefit.
    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: Any potential problem using two pumps?

    I found it virtually impossible to get the pump running through the solar panel when the sun was out and not when cloudy... unless I was home to micro-manage it.

    I want one pump on a temperature switch pumping through the solar panel and the sand filter pump running 4 hours a day regardless of sun.
    21K gal kidney shape in-ground pool
    Hayward C1200 filter
    Single speed pump

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    JasonLion's Avatar
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    Re: Any potential problem using two pumps?

    The simplest thing to do is to get a solar controller with an automated diverter valve that redirects the water towards the panels when they are warmer than the pool.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Any potential problem using two pumps?

    But then the pump would need to be on all day every day just in case the sun is out. I'm in Maine and the weather is unpredictable at 7am when I leave for work.
    21K gal kidney shape in-ground pool
    Hayward C1200 filter
    Single speed pump

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    JasonLion's Avatar
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    Re: Any potential problem using two pumps?

    The controller can turn on the pump, as well as switch the valve, if that is required.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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