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Thread: Should I shock again?

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    Should I shock again?

    Hi pool was opened on Monday (by a pool company). They supposedly are to put an initial shock into the pool. The pool was overloaded with algae, even worse then green it was basically black. I let it sit overnight since the company supposedly shocked and it turned to more of a green the next day (yesterday). So I took my levels and my FC was at .5. So I went ahead and put 12 gallons of liquid bleach (used the pool calc and used mustard algae option). Today it's beginning to look blue..ish...but is very cloudy. I did a complete test, my combined chlorine is crazy high, here are my levels.

    FC - 1
    CC - 8
    PH - 7.8
    T/A - 90
    CH - 140 (tested even though my pool is vinyl)
    CYA - 30

    Should I go ahead and shock again? If so how much ??
    46k gallon vinyl, Intelliflo VF, Quad DE 100, Autopilot DIG60, Raypak R405a, Bravo Fury Auto Cleaner

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    dmanb2b's Avatar
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    Re: Should I shock again?

    keep adding that chlorine...your not done shocking

    Measure the FC level

    Add enough chlorine to bring FC up to shock level

    Repeat steps 1 and 2 as frequently as practical, as often as once per hour, and not less than twice a day, until:
    CC is 0.5 or lower;

    An overnight FC loss test shows a loss of 1.0 ppm or less;

    And, if you don't have a FAS-DPD test kit, the water is clear.


    The goal of shocking is to add enough chlorine to oxidize all of the algae, combined chlorine, bacteria, viruses, ammonia, and other organic contaminates. Oxidization breaks down the organic molecules into smaller parts which are harmless. When shocking, you need to keep adding chlorine until the breakdown process is complete.

    Higher FC levels will oxidize contaminates more quickly, but levels that are too high can cause damage to the pool or the pool equipment. Recommended shock levels are designed to break down contaminates reasonably quickly while posing minimal risk to the pool. It is impossible to know in advance just how much chlorine will be required to shock the pool. Instead, chlorine is added to maintain shock level until testing shows that the process is complete.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Butterfly's Avatar
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    Re: Should I shock again?

    That's a lotta CC

    What dmanb2b said

    I also suggest you lower your pH to around 7.2 . Measure pH and adjust when your FC is below 10.
    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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    dmanb2b's Avatar
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    Re: Should I shock again?

    Glad you agree butterfly I forgot to give credit to Pool School...since I just copied and pasted from there.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

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