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Thread: opened pool, slightly green water, starting to shock it

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    Join Date
    May 2009
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    Jasper, TN
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    opened pool, slightly green water, starting to shock it

    I know this has probably been asked a million times, but just a little nervous as this the first 'opening' I've had since we got the pool last summer.

    I don't have all the numbers yet, but the main thing is I need to triple check on it the CC.

    CYA is about 35
    used walmart kit for PH test, used a little muriatic acid to drop the PH to what looks like 7.4 on the chart.

    I didn't use pool calc yet as I knew I'd need a lot of bleach to start with since it was a little green (cover slipped in pool over the winter but kept it from becoming a total swamp).

    Right now, used fas/dpd test, FC=12 and CC=0

    water is not sparkling clear but not what you'd call cloudy either, no green left of course.

    So do I need to go up more and keep it shock level? or is ok to let FC fall back down? I'll be adding more CYA once shock is done so my target will change as I adjust CYA.
    24' x 52" AGP = 13.5k gallons
    Dynamo 2.0 HP pump,Sand Dollar sand filter
    Polaris 65 vacuum (good when there are a ton of leaves on bottom), Pool Rover Jr. (LOVE it, but power box dead right now), AquaCritter (an excellent suction side cleaner)

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    Molson's Avatar
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    Re: opened pool, slightly green water, starting to shock it

    Post a full set of numbers if you can.

    If your CC is truly 0, then it looks like you got the algae. If it were me, and it wasn't sparkly yet, I'd keep the FC up for another day, but you can let it come back down to normal levels.
    40 x 16 IG Vinyl. Goldline SWG
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    frustratedpoolmom's Avatar
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    Re: opened pool, slightly green water, starting to shock it

    Did you do an overnight FC loss test? To see if the FC is holding overnight - then you'll know if you are done shocking and can let it drop down to normal, letting the filter do the trick. But you have to confirm that first thru the overnight test. IF the FC holds overnight, you could try a little DE in the sand filter to help with clarity - instructions are in pool school.
    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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    duraleigh's Avatar
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    Re: opened pool, slightly green water, starting to shock it

    So do I need to go up more and keep it shock level? or is ok to let FC fall back down?
    You are finished with the shock process when..
    1. Your pool water is sparkling
    2. Your CC's are .5ppm or less
    3. You can hold your FC overnight without losing more than 1ppm.

    Get that pool water sparkling....keep the chlorine up!
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  5. Back To Top    #5

    Join Date
    May 2009
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    Jasper, TN
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    Re: opened pool, slightly green water, starting to shock it

    I couldn't find r12 to do CH test. It's an AGP with vinyl liner though.

    CYA = 35
    FC = 12.5
    CC = 0
    PH = 7.4
    TA = 60

    I will do overnight test tonight/in the morning.
    24' x 52" AGP = 13.5k gallons
    Dynamo 2.0 HP pump,Sand Dollar sand filter
    Polaris 65 vacuum (good when there are a ton of leaves on bottom), Pool Rover Jr. (LOVE it, but power box dead right now), AquaCritter (an excellent suction side cleaner)

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