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Thread: Calcium Hardness reads 420

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    Calcium Hardness reads 420

    Just wondering how concerned I should be with my hardness reading 420. Everything else seems to be in order. (Salt system with a plaster pool)

    TA- 80

    24,500 gallon plaster i/g
    sand filter (Hayward S-200)

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Calcium Hardness reads 420

    It's at the higher end of "doable" but "doable" nevertheless.

    I would make a note to monitor pH and TA carefully all swim season, not allowing your pH to get much over 7.5. That gives you pleanty of "fudge factor" and you will never have an issue. Do you know the CH of your fill water? If not, test and post that up.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Calcium Hardness reads 420

    Thanks I'll put up those numbers tomorrow.
    24,500 gallon plaster i/g
    sand filter (Hayward S-200)

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Calcium Hardness reads 420

    Just keep a close eye on your pH and don't let it go above where it is now.

    By keeping your pH low your TA is liekly going to come down too.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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