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Thread: Is algaecide necessary?

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    Is algaecide necessary?

    I opened my pool sunday and water looked pretty good. On the initial test my results were FC=0, CC=0, CYA=40, and PH=7.4. i added bleach to get to shock level and have had it there 2 days. Pool looks great and i plan on performing the overnight chlorine loss test tonight. Do i need to add algaecide?

    Also, my cya is almost exactly the same as last year. Is this normal since i haven't had to replace much water?
    Jeremiah Hough

    22,000 gallon, vinyl liner, chlorine, with auto cover

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    Mod Squad Bama Rambler's Avatar
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    Re: Is algaecide necessary?

    Algaecide in never necessary in a properly chlorinated pool. Chlorine is the best algaecide there is when properly dosed.
    Dave J. TFP Moderator
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    Butterfly's Avatar
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    Re: Is algaecide necessary?

    Also, my cya is almost exactly the same as last year. Is this normal since i haven't had to replace much water?
    The CYA test is +/- 15, so, yeah, it can happen.

    We don't normally recommend an algaecide, but when we do, we recommend Polyquat 60. Most folks that use an algaecide add it at closing. But, as Bama pointed out, maintaining a properly chlorinated pool, you should not need an algacide.
    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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