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Thread: Calcium Scaling

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    bear31088's Avatar
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    Calcium Scaling

    I've read in some past posts that high ph can cause calcium scaling. If that is true, would it stand to reason that lowering the ph for a period of time would help eliminate the scaling? Just wondering...

    FC 8
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    Barry, Central GA
    15X36 IG 14,200 gal fiberglass pool. Hayward Sand Filter with 1 HP Hayward SUPER PUMP. Pentaire "Kreepy Krawly Robotic Cleaner

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    Mod Squad jblizzle's Avatar
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    Re: Calcium Scaling

    Yes, if you lower the CSI (see PoolMath) to be negative and with a lot of brushing, you can reduce the calcium scaling ... but this it over a period of months, not days.
    Jason, TFP Moderator
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    bear31088's Avatar
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    Re: Calcium Scaling

    Thank you for your input. So...does CSI have to be at some specific negative value or just "negative"?
    Barry, Central GA
    15X36 IG 14,200 gal fiberglass pool. Hayward Sand Filter with 1 HP Hayward SUPER PUMP. Pentaire "Kreepy Krawly Robotic Cleaner

    e-mail: oso49@cox.net

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    JasonLion's Avatar
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    Re: Calcium Scaling

    There are problems with this approach. The main one is that calcium scaling is typically patchy, various spots here and there. If you lower your PH low enough to remove calcium scaling, you will also be etching plaster off of the rest of the pool, where there is no scale, as well as removing scale. You don't really get the control you need. Also, low PH can damage other parts, especially gas pool heaters. Never attempt this if you have a gas pool heater. You also end up with lots of calcium in the pool water, which must then be replaced, or you will just have scaling all over again.

    To effectively remove scale, CSI needs to be -1.0 or lower.
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    Mod Squad jblizzle's Avatar
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    Re: Calcium Scaling

    Thanks Jason, I did not realize you would need the CSI that low and good points about the patchy nature.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    bear31088's Avatar
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    Re: Calcium Scaling

    Thanks all for the assistance. I appreciate your inputs. Now...what to do. I think I'll buy the wife some SCUBA gear and a good brush...
    Barry, Central GA
    15X36 IG 14,200 gal fiberglass pool. Hayward Sand Filter with 1 HP Hayward SUPER PUMP. Pentaire "Kreepy Krawly Robotic Cleaner

    e-mail: oso49@cox.net

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    Patrick_B's Avatar
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    Re: Calcium Scaling

    Good luck with that, you may be sleeping in the pool if she reads this.
    TFP Moderator
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    Re: Calcium Scaling

    Yeah. Let us know how that works.
    Gerry
    27' x 54" AG Salt Water Pool Installed 2014, Hayward 23" Sand Filter, 1 HP 2-Speed Power-Flo Matrix Pump, AQ-TROL SWG, TF-100 Test Kit

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