"Had our house tiled a year and a half ago, and about two months after the job was done, started to notice the sealer ‘wearing away.' Upon closer look, I noticed the grout was powdery, and coming out. What, in your opinion, could cause the grout to become powdery in only two months?
"It's sad, and very disappointing, to look at the floor today, 1 1/2 years later. Large areas of grout have come up all throughout the house, and the nearly new floor we paid $5,000 for looks so bad. The original contractor will not help, and has tried to blame the problem on our dogs."