Our pool was in pathetic shape! The tile had a deep build up of calcium all around the water's edge with some calcium "growing" up the tiles towards the deck. Missing grout between the tiles was just as evident as a toothless mouth. The bottom and sides were a kaleidoscope of colors, patches of various shades of tans and greens and blues. Tile Savers of Nevada saved our ten year old pool. The calcium was bead blasted off, the grout was replaced between the tiles, and the acid washing restored the pool plaster to a brilliant white. The pool is now the shining star of our back yard. Looks like new again. Thank you, Terry!