Shock deposits / lumps - will an acid wash cure this?

[Brett_N]

Not sure if it was the previous owners being lazy, or the realtor not knowing pools, but it looks like i have lumps all over the pool caused by shock not dissolving properly? I'll try and get an underwater picture, but they are basically lumpy things that i can scrape off with a putty knife, and they dissolve. But, they are everywhere. They are gray with white hard deposits in the middle, and everywhere!!!!

the pool needs a good acid wash anyway, but I can't do that for a couple months since it's so hot right now. Wondering if that will cure it? Maybe I'll try and carefully remove one and see if muriatic acid dissolves it.

 

[Patrick_B]

When you pull one out, save one, crush it, and see if smells strongly of Chlorine before you put on in acid. Let us know what you find, I'm sure others would be interested besides me.

 

[Brett_N]

Will do Patrick - I'll try and get some pictures tonight. Need to test the new waterproof phone case anyway

 

[JoyfulNoise]

Brett_N,

Just food-for-thought here - read user @OnBalance's post about calcium nodules. Since you did not control the pool prior to getting the house, there's no telling what was done previously. Calcium scaling is always a possibility.

Good luck.

 

[Brett_N]

Thanks Joyful....hmm.....this may be what I have - but if it is, I'm screwed and may need to have the whole pool re-plastered. Yay.

 

[mmcwhorter]

I used a pumice stone to knock away calcium "nodules" in my spa once before. They were on the spa seat and walls.....not real big. About the size of a sunflower seed kernel or less. My wife was happy because the calcium deposits were ruining the bottom of here expensive bathing suits. I'd need to maintain it about 1x per year.
The pool was kept pretty well balanced (usually!!!).

 

[JoyfulNoise]

I used a pumice stone to knock away calcium "nodules" in my spa once before. They were on the spa seat and walls.....not real big. About the size of a sunflower seed kernel or less. My wife was happy because the calcium deposits were ruining the bottom of here expensive bathing suits. I'd need to maintain it about 1x per year.
The pool was kept pretty well balanced (usually!!!).

That's not surprising. Spa water chemistry is easily thrown off and can become scaling. Usually you lower the pH and TA a bit before soaking to abate some of the pH rise.


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