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Thread: Calcium buildup on pool walls forms on hairline cracks

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    Calcium buildup on pool walls forms on hairline cracks

    Hi everyone.
    I was in the process of fixing a corner of my pool and i had to drain the water 2 feet. I discovered that on the pool walls there are what looks like calcium build up. It seems like it forms and top of small hair line cracks.
    The guy from the pool company that plastered the pool 3 years ago, said that it is because my water is LOW on calcium and it is leaching calcium FROM the plaster.
    Does it make sense?
    As far as I remember, my water was about 300-350ppm and it was on the high side. I try to maintain PH of 7.2-7.6 range. Granted at winter time when water was about 50-55F, I might have let the PH to go to 7.8 or so.
    I'm attaching some pictures for you guys to take a look at.

    If that is the case, is it good idea to use Shock as i have plenty of it in my garage, and i know that using it will raise the calcium level which is usually not that great. I need to clear the pool up from some green water formed as i was not running the filtration during a week when the pool corner was getting fixed.
    Attached Images Attached Images
    35k gal 850sq ft french gray plaster, Jandy JEP1.5HP ePump, Pentair 60sq DE filter, Pentair Intellichlor IC40, 10 Fafco sunsaver 12'x4' panels with Goldline GL35. Laars lite 325k BTU NG heater, Hayward Colorlogic 4.0 LED light. Plumbing: 2" PVC, No main drain, four 1" returns, 1 skimmer with 2 wall drains, one 1.5" suction cleaning port.

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Calcium buildup on pool walls forms on hairline cracks

    You need to confirm your calcium level currently. If it is 300-350 that is in the "perfect" range. Your pool is clearly not leaching calcium but rather depositing it.

    Do not use Cal Hypo (I guess that's what you are calling "shock") as it will only exacerbate your problem

    Post current test results and this should be fairly easy to resolve but stop listening to your pool guy.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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