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Thread: Is this calcium?

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    Is this calcium?

    I just chipped this stuff of a couple of weeks ago and its back. What is causing it and how do I remove it for good? Usually I can use my fingernail and break it apart.

    Also my pool plaster sometimes looks like this where you can see spots
    On the side. There are also a couple of areas where the plaster appears to be worn down to where you can see whatever is dark behind it. Pool is 12 years old and previous owner did not take care of it.
    Attached Images Attached Images
    built 4/08/2000 16 x32 460 Sq FT Pool 16,000 gallons 3.5 ft 5 ft 3.5 ft sport pool

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    Join Date
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    Re: Is this calcium?

    What you see below the waterline appears to be calcium deposits. The white stuff on the grout between the tiles is efflorescence and can be removed with a dilute solution of water and muriatic acid. Be sure to wash the tile well with water after applying the acid solution.

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    Re: Is this calcium?

    Ok thanks, can someone give me instructions on making the solution and then applying it? Like what do I need exactly.

    Also as far as the calcium deposits, can that be fixed? It seems that the are really visible some days and other days they are not!
    built 4/08/2000 16 x32 460 Sq FT Pool 16,000 gallons 3.5 ft 5 ft 3.5 ft sport pool

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    Re: Is this calcium?

    Tt

    built 4/08/2000 16 x32 460 Sq FT Pool 16,000 gallons 3.5 ft 5 ft 3.5 ft sport pool

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    duraleigh's Avatar
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    Re: Is this calcium?

    Mix the muriatic acid with 3 parts water to 1 part muriatic. Apply it to the efflorescence. If it foams, it's working, if it doesn't, mix it stronger 'til it does. rinse well.

    For the calcium scale underwater, you will need to post a complete set of test results so we can see what's going on.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Is this calcium?

    Thanks.

    As for the test results to see underwater scaling, is it something I have done or something the previous owner did? I assumed it was the previous owner who did not take care of the pool and did that damage?
    built 4/08/2000 16 x32 460 Sq FT Pool 16,000 gallons 3.5 ft 5 ft 3.5 ft sport pool

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    Richard320's Avatar
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    Re: Is this calcium?

    Quote Originally Posted by 4x4tx
    Thanks.

    As for the test results to see underwater scaling, is it something I have done or something the previous owner did? I assumed it was the previous owner who did not take care of the pool and did that damage?
    Could be either. I have it, too.

    If you live in a hard water area, it's very hard to avoid. It requires obsessive attention to pH, TA, CH, and the CSI that poolcalculator will generate.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Is this calcium?

    I have noticed on some days it is very hard to see and others it is very visible...I thought it was when I shocked the pool it would go away but I dont think that was it.
    built 4/08/2000 16 x32 460 Sq FT Pool 16,000 gallons 3.5 ft 5 ft 3.5 ft sport pool

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    Richard320's Avatar
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    Re: Is this calcium?

    Quote Originally Posted by 4x4tx
    I have noticed on some days it is very hard to see and others it is very visible...I thought it was when I shocked the pool it would go away but I dont think that was it.
    Bright sunny days makes it almost disappear. Twilight or overcast makes it very visible.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Is this calcium?

    Hmm that could be...but I think when I took those pics it was sunny...I just thought there was something in the chem balance that made it less visible...does acid wash get rid of that or do I need to replaster?

    What about the efflorescence, is that a sign of hard water? I get that really bad, its a battle.
    built 4/08/2000 16 x32 460 Sq FT Pool 16,000 gallons 3.5 ft 5 ft 3.5 ft sport pool

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    Richard320's Avatar
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    Re: Is this calcium?

    Acid wash will remove it. But if your plaster is old and crumbly, it might finish it off and necessitate a replaster.

    Try adjusting your water to a negative CSI - something close to -.6 - and concentrate your brushing on one area and see if it doesn't fade in a week. If so, and you're the patient type, you can remove the scale yourself over the next few years.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Is this calcium?

    Drained my pool down to drop cya and took some pics [attachment=1:3cgr02pn]ImageUploadedByTapatalk1372386157.416695.jpg[/attachment:3cgr02pn][attachment=0:3cgr02pn]ImageUploadedByTapatalk1372386174.999655.jpg[/attachment:3cgr02pn]

    Look like scale?
    Attached Images Attached Images
    built 4/08/2000 16 x32 460 Sq FT Pool 16,000 gallons 3.5 ft 5 ft 3.5 ft sport pool

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