Brown Discoloration Around Mosaic
Our 2-year-old concrete/plaster pool has a brownish discoloration around the tile mosaic in the shallow end. It was noticeable last year but has become quite an eye-sore this season. We tried scrubbing with a bruch, nothing. We have tried putting shock directly on the area overnight, nothing. We then bought the Jack's Magic Stain ID kit, all the tests did nothing. We tried pH Down in a sock on it, nothing. There are no other stains in the pool. A picture showing the discoloration is in the gallery of this entry. Any ideas?