I used to use that silica litter and I really liked it. Sometimes some of the crystals would escape the litter box and it would really hurt when I stepped on them. And after around 3 weeks it would have a horrible amonia smell, which is when I would change it. The reason why I stopped using it was because one day Corkscrew decided that he didn't like it and started using the floor next to the litter box. WHen I changed to scoopable litter he started using his litter box again. I like the scoopable litter, if I scoop out the clumps every day it doesn't smell at all, and it's a lot cheaper.