Has anyone experience this issue with their plaster? New construction and completed January 2016. We elected Diamond Brite Blue Quartz plaster. Approx. 4 months ago these circles started appearing in the shallow end of the pool, on the tanning ledge, and on the steps. There is even a "foot-print" shape circle in the plaster. Any thoughts on what could be causing these circular patters to appear? The circles seem to be getting slowly wider and appearing in other places. PB and Pool Supply Store are at a loss. 30K saltwater pool running 3.5' shallow to 9.5' deep-end.
These are the pics from the shallow-end. Thanks for all your insight and help to a new pool owner!