I have been using Tidy Cat Clumping Litter exclusively for years, and have never had a problem until recently. I had issues with the last 5 or 6 containers. It is not clumping like it should. When you scoop, the "clumps" break apart into pieces and leave an impossible mess in the litter box. Not sure if the formula has been changed. Anyway, if this continues, I will be forced to find a new brand to use.