Small white 'pimples" on resurfaced pool wall

Jun 6, 2011
59
About two years ago, I had my pool compeltely resurfaced. Recently I have noticed several small white 'pimples' forming on the pool wall. When I scratched a few of them it appears something is seeping through the pool wall and hardening into a white crystaline substance.....Any idea what this might be?
 
Yes, that's it exactly...thanks.... The first nodules were scrapped off bt mne over a week ago and are still gone. I did notice a couple more this morning and scrapped them off as well.
Is there a chemical ratio that is best for this condition?
 
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