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Thread: Balancing pool

  1. #1
    Junior Member
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    Jul 2012
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    Balancing pool

    I think I may be on the right track with what I'm thinking these are my current pool levels:

    FC-8.5ppm
    CC-1.5ppm
    PH-7.1
    TA-80ppm
    CH-340ppm
    CYA-90ppm

    So I'm thinking after reading the ABC's of pool chemistry and and the chlorine/cya chart I need to use liquid shock to balance the free chlorine levels and soda ash to raise my ph levels. Does that sound right?
    13,000 gallon in-ground pool 11'x31' plaster pool about 11-15 years old; Ace Armature and Motor pump; Hayward C4030 square foot cartridge filter*

  2. #2
    Mod Squad jblizzle's Avatar
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    Re: Balancing pool

    Your CYA is pretty high ... likely a 50% water replacement would be the best first step.

    Barring that, leave the pH and start the shock process outlined in Pool School because your CC >0.5.

    How does the water look?

    Posted from my Droid with Tapatalk ... sorry if my response is short
    Jason, TFP Moderator
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  3. #3
    Junior Member
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    Re: Balancing pool

    Ahh ok, water looks clear
    13,000 gallon in-ground pool 11'x31' plaster pool about 11-15 years old; Ace Armature and Motor pump; Hayward C4030 square foot cartridge filter*

  4. #4
    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    Re: Balancing pool

    I'd suggest draining about 50% of the water and replacing it and then start the shock process. If you start to shock at a CYA of 90 your FC will be 35 which will require 4 large jugs of bleach to get there. If you drain and refill your shock level will be 18 and it'll take 1 large jugs to get there. And getting there the first time is only the begining. You'll have to maintain shock level until you've passed the OCLT.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  5. #5
    Senior Member
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    2,599

    Re: Balancing pool

    The suggestion to shock your pool is based on the high CC value of 1.5. This indicates presence of after-products of chlorine usage in quantities that tell us that you have algae or other organics in the pool. It is possible to have algae that you do not see, this will increase chlorine demand and if more chlorine is not provided the algae will grow to the point of being visible, either on surfaces (can be behind lights or ladders or such) or floating in the water seen first as a dullness then getting greener.

    If your pool has been covered, it may just be a build-up of CC that will go away when uncovered. You could try that first if that is the case. Otherwise, you ought to shock, and to reduce your CYA levels.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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