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Thread: low ph reading after adding cya

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    hawkeye's Avatar
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    Jun 2009
    Location
    davenport,iowa
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    low ph reading after adding cya

    im still waiting for the pool to hold fc overnight, so im not sure if ph will come back up on its own. what should i do? here are test results


    fc 15
    cc 1
    ph 6.8
    ta 100
    cya 40
    ca 250
    18ft 52in deep doughboy 8000 gallons
    22 in sand filter
    1 1/2 pump
    tk-2006 test kit that rocks!
    12.5% chlorine
    aqua critter vac

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    frustratedpoolmom's Avatar
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    May 2007
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    SWSuburban Chicago, IL
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    Re: low ph reading after adding cya

    If PH is that low while you are shocking, I'd target 7.2 and go ahead and raise it with Borax.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: low ph reading after adding cya

    I would try airation to raise PH without affecting TA.
    coloeb,
    20k gal. IG fiberglass/plaster rectangle 32'x16'
    Hayward Superpump 3/4 H.P. primary Hayward model 5060 Booster Pump
    Hayward Pro Series High Rate Sand Filter
    Pentair Model 320 automatic Chlorine/bromine in-line feeder

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    hawkeye's Avatar
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    Jun 2009
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    davenport,iowa
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    118

    Re: low ph reading after adding cya

    update on my pool opening so far so good! i put the filter on a digital timer for run time of 6 hours 10am-4pm so it is filtered by time we get home from work is this enough run time to filter entire pool, i ordered a hayward aqua cleaner so we dont have to vac when we get home anymore so we can swin quicker, is there a set time i should run to filter pool completely?.....

    fc 8
    cc.5
    ta 140
    ch130
    ph 7.8
    cya 30-40 should i raise the cya to 50 range
    18ft 52in deep doughboy 8000 gallons
    22 in sand filter
    1 1/2 pump
    tk-2006 test kit that rocks!
    12.5% chlorine
    aqua critter vac

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: low ph reading after adding cya

    Figuring out the ideal pump run time is complex. Your current 6 hour run time is probably about right. You can read How to Determine Pump Run Time in Pool School for suggestions on how to find a more ideal time.

    Yes, you should raise CYA to 50, but there isn't any rush to do that right away.
    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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