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Thread: Do I even need to shock now?

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    Do I even need to shock now?

    I have been reading these forums and using the pool calculator to achieve better pool water. My numbers were way out of line to start. Right now I have the following results:

    FC 3
    CYA 30
    pH 7.4
    TA 150

    I don't have a current CC reading here with me. I have been working to lower my TA by running a waterfall and then adding MA to lower the pH. The TA has gone from 250 to 150 right now.
    My CYA was also zero only a week ago but is now within range.
    My water is crystal clear but I have a few very, very small patches of green algae and I also have some light brown staining on the side walls from dirt blowing in and settling over the winter. I have brushed the walls many times.

    My question is. Do I need to shock? Do I need to attempt to hold the FC at a certain level, etc?

    1) 25,000 gallons
    2) Sand Filter 24"
    3) Inground
    4) Plaster
    5) 2 hp pump on 2'' pipe

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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: Do I even need to shock now?

    The green algae that you know you have is only gonna get worse. Yes, you should shock. See the Chlorine/Cya chart in pool school for the FC level to Hold and read shocking your pool. Should be relatively easy and quick at this point.
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