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Thread: I should know this but...

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    I should know this but...

    A year goes by and I forget how to balance my water when first openning. I put 7 lbs of cya in the past few days. I was reading 0 when I opened pool. I seem to be holding some chlorine overnite. I now have 2ppm of fc and .5 of cc.

    How do I shock when I have a cya of 0. I went to the chart and there is no 0 for a cya reading so I can't come up with a good multiplier for shocking.

    The water is cloudy and a light green. Cannot see the bottom, maybe a little in the low end. I been brushing and backwash when needed. Just got done vacuum and now I am at a loss of what to do next.

    My ph is 7.5 and ta is 60. Any advice?
    20,000 gallon viking fiberglass pool w/aqua comfort heat pump, pentair whisperflo pump 1.5hp autopilot dig-220 swg w/RC42 cell (42,000), pg2000 fiber optic lights
    hayward sand filter(medium is echoglass)
    Blue diamond robot cleaner

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    JasonLion's Avatar
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    Re: I should know this but...

    Shock level when CYA tests at zero, but there was CYA in the pool at some point, is around 10.
    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: I should know this but...

    I put 7 lbs of cya in the past few days.
    Hold on before you shock. Your CYA is not zero if you put that much CYA in your pool.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Butterfly's Avatar
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    Re: I should know this but...

    24 hours after the CYA has dissolved, assume it is there and adjust your FC/shock levels accordingly.

    Looks like 7 lbs. would get you to about 40 CYA.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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  5. Back To Top    #5

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    Re: I should know this but...

    4 out of the 7 lbs. is still in the sock in front of the return. The 3 lbs. is in pool now for a few days but I did backwash a few times. So since I cannot get a cya reading yet, what should I assume I have?
    20,000 gallon viking fiberglass pool w/aqua comfort heat pump, pentair whisperflo pump 1.5hp autopilot dig-220 swg w/RC42 cell (42,000), pg2000 fiber optic lights
    hayward sand filter(medium is echoglass)
    Blue diamond robot cleaner

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    Butterfly's Avatar
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    Re: I should know this but...

    Quote Originally Posted by ethany
    4 out of the 7 lbs. is still in the sock in front of the return. The 3 lbs. is in pool now for a few days but I did backwash a few times. So since I cannot get a cya reading yet, what should I assume I have?
    Well, I'm gonna guess that you got about 3 lbs in the pool.

    If you also added it via sock method, then the backwashing didn't remove much of it.

    You should get a second opinion soon
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: I should know this but...

    Squeeze that sock every time you walk by it and get it into solution. I would assume around 40ppm and shock accordingly. You will do no damage to the pool.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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