My mom used the silica litter for her cat. Kitty is very ancient and was having a hard time cleaning the litter out of his toes - he had a tendency to walk through the box to get out. She liked the silica in that it didn't stick. She didn't like how it got all over the place. My 5 year old nephew asked Grandma what she was going to do with all those "eyeballs" on the floor. She has switched to a litter that is made of all natural substances, bought from Mounds.