I went to clean the pool tile today and then noticed that when I wet the grout there are areas that are blue! It looks like the grout is stained.
My grout is a brown color. I tried a pumice stone and it's not coming off. As far as I can tell, this discoloration is ABOVE the water line only.
I noticed that this is not all the way around the pool. It is mostly by the tanning ledge where we have rock on the ledge. Any ideas???
pool tile 2.JPG