I wasn't sure which category to post this in as I do not believe this is an algae problem. In February I had my pool resurfaced with Quartzscape in French Gray. On both the floor and walls I have these white spots/blotches cover a high percentage of the pool area. I have scrubbed them but nothing happens. It does not appear to be a growth of any kind. Oddly enough the attached spa does not have this issue. I rarely use powdered shock. I have contacted to plaster company to come take a look (the 1st pic has a shadow of a palm tree). Any ideas?