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Thread: Is this calcium scaling?

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    sb127's Avatar
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    Is this calcium scaling?

    I wasn't sure which forum to post this in, so mods please move the thread if there is a better place for it.

    Anyway....our pool was built this year & filled in late April. If my memory serves me correctly, I noticed these two white areas back in May. They haven't grown or shrunk over the past few months. Does it look like calcium scaling or some other remnant that might have been left over from construction? If it is calcium scaling, what is the best way to spot treat it? These are the only two spots in the entire pool.

    This first area is on the spa spillway. Right in the middle of the picture, between the brown and gray stones.



    This second area is where the base of the rock waterfall meets the waterline tile. Pretty much in the middle of the picture as well.....three spots.

    20,000G Freeform I.G., Pebble Finish, Rock Waterfall, (2) 2.0HP Jandy Pumps - one filtration & one waterfall, Jandy 60 sq. ft. DE filter, In-floor Cleaning, LXI 4000 Gas Heater, Jandy Aqualink controller, LED lighting

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    Re: Is this calcium scaling?

    This is what mine looks like.

    Efflorescence. This is minerals leaching out from the mortar between the stones. It can be removed with a very dilute acid mixture. Use care during this process as you can easily remove more than you need to.
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    sb127's Avatar
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    Re: Is this calcium scaling?

    Makes sense since both areas are on mortar.

    Quote Originally Posted by 257WbyMag
    It can be removed with a very dilute acid mixture.
    By "very dilute acid mixture", what exactly would that be? I assume some combination of muratic acid and water, but what ratio?

    Thanks!
    20,000G Freeform I.G., Pebble Finish, Rock Waterfall, (2) 2.0HP Jandy Pumps - one filtration & one waterfall, Jandy 60 sq. ft. DE filter, In-floor Cleaning, LXI 4000 Gas Heater, Jandy Aqualink controller, LED lighting

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    Re: Is this calcium scaling?

    Sorry for leaving that out.

    1 part muriatic acid to ten parts water. Stiff brush (no metal). Be very careful. Rinse the area well with water when you are finished.

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    Re: Is this calcium scaling?

    Quote Originally Posted by 257WbyMag
    Sorry for leaving that out.

    1 part muriatic acid to ten parts water. Stiff brush (no metal). Be very careful. Rinse the area well with water when you are finished.
    I assume I would do the 1:10 ratio mix in a spray bottle, right? Spray it on there. Brush. Wash.

    If I leave it alone and do nothing, should it get worse? Or would it ever go away on it's own?
    20,000G Freeform I.G., Pebble Finish, Rock Waterfall, (2) 2.0HP Jandy Pumps - one filtration & one waterfall, Jandy 60 sq. ft. DE filter, In-floor Cleaning, LXI 4000 Gas Heater, Jandy Aqualink controller, LED lighting

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    Re: Is this calcium scaling?

    I would just put mine in a plastic cup and use a dishwashing brush. Dunk the brush in there and scrub it gently (don't get any in your eyes!!!). Rinse when finished.

    I will go after mine a couple of times per year. It always comes back and I couldn't tell you why really. But the CH of the pool water doesn't have anything to do with it. I have had a negative CSI for a long time and yet I still get this. Below the waterline though, there is nothing. My CH runs about 225 ppm.

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    Re: Is this calcium scaling?

    Thanks for the info. I'll get after it in the next few weeks.
    20,000G Freeform I.G., Pebble Finish, Rock Waterfall, (2) 2.0HP Jandy Pumps - one filtration & one waterfall, Jandy 60 sq. ft. DE filter, In-floor Cleaning, LXI 4000 Gas Heater, Jandy Aqualink controller, LED lighting

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