Last year the pool (inground concrete) was totally resurfaced with plaster (sprayed on after old had been scraped back and new applied about half-inch thick, then smoothed over to finish.) Now, 18 months later, it's possible to just rub your finger lightly over the surface (underwater) and tiny particles will float off - they feel like finely granulated sugar. The pool has never been emptied since it was relined and I'm not sure if this will be a serious problem, go away or whatever! (pH constant 7.4, bromine pool)