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Thread: Very low calcium, extremely high chlorine

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    Very low calcium, extremely high chlorine

    We have never worried about calcium in our pool because the previous owner told us that with a fiberglass pool it doesn't really matter. However, the folks that just installed our new pool pump said that low calcium can cause problems in pipes & equipment, so we decided we should pay attention to it.

    We had just shocked our pool, so chlorine was about 12. pH and Alkanity were perfect, but calcium was only about 40. We added 4 lbs of calcium chloride, and today, it's up to between 50-60, but chlorine is now 28. Even if we leave our pool open all day (which we don't typically do if we're not using it), the chlorine level does not dissapate that quickly. If we keep adding enough calcium chloride to get the calcium up to 200, I have no idea how high the chlorine is going to go.

    Also, our CYA is 90, so we plan to avoid using any pucks unless there's another way to bring that level down too.

    As an FYI, we're using a Taylor Test Kit with reagents that are either new this year or within the last 2 years. The kit is stored in a mudroom closet, so away from heat/cold/light.

    Any suggestions for what we ought to do to get this balanced?
    ============================================
    Central Vermont
    Viking fiberglass in-ground pool, 13,700 gallons with Coverstar automatic cover
    Hayward MaxFloVS SP2303VSP pump with Pentair Rainbow Lifegard cartridge filter system
    Use a combo of BBB and pucks when we're away from home

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    Mod Squad zea3's Avatar
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    Re: Very low calcium, extremely high chlorine

    Calcium chloride should not effect your FC level. According to PoolMath, 64 ounces of calcium chloride should raise the CH by 32ppm. From the results you posted, a rise in FC of 16ppm, and rise in CH to 50-60ppm, it looks like you may have add calcium hypochlorite instead. According to PoolMath 64 ounces of cal-hypo (43%) would raise FC by 17ppm and raise CH by 12ppm. Do you still have the container from the product you used?
    TFP Moderator
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    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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    Re: Very low calcium, extremely high chlorine

    It was Robelle Calcium Plus. Container says that it's calcium chloride.

    It's only been about 24 hours since we added it. Should we wait longer to retest?
    ============================================
    Central Vermont
    Viking fiberglass in-ground pool, 13,700 gallons with Coverstar automatic cover
    Hayward MaxFloVS SP2303VSP pump with Pentair Rainbow Lifegard cartridge filter system
    Use a combo of BBB and pucks when we're away from home

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    In the Industry

    duraleigh's Avatar
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    Apr 2007
    Location
    Sebring, Florida
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    30,085

    Re: Very low calcium, extremely high chlorine

    Calcium chloride has absolutely no affect whatsoever on chlorine. Additionally, the only way chlorine can rise in your pool is if you put it in there.

    We need to get you started in Pool School. I would read "The ABC's of Pool Water Chemistry" as a start.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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