New plaster pool build here 1 year ago, was replastered upon opening this Spring (long story, main drains were leaking and drilled out/repaired). Now, 3 months after new plaster, we are noticing these grey dots/spots on the plaster on the walls and floor of the pool in addition to tiny black specs. We noticed it more after shocking although that may have been coincidental. We just used pool magnet plus per the retail store with no results. Also, starting to notice these bright white areas as well. Any advice?
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