OK, just to check out your theory, I took a sample of clumpling litter generously donated by Sylvester. Adding water makes it fall apart rapidly. Therefore, be it concluded that Henry is the authority on cat litter and is hereby anoited the title "knows his sh...t". I would have never guessed.
BTW, I don't know why it works, but now I know it does (LOL).
Another BTW, Will I now have the same problem as the original poster?