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Poor water chemistry. Ph and or total alkalinity were not maintained. You have calcium deposits or scale as it is sometimes called. Possibly a light acid wash at the start of the season done by a professional.

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15y ago

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Q: Gunite pool and just opened it for 3rd season A noticeable and rough sandpaper-like surface formed on the sides and bottom of the pool where waterline was in winter what caused and how to fix?
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