I like the ScoopFree Sensitive Crystal Litter trays 3-Pack these trays work very well, there's not a mess from the litter on the floor! The cat loves it and I like that it doesn't smell at all! I also like that I don't have to scoop it myself! The Crystal's make it where I don't have to change it so often! It has lasted for several weeks before having to change it! It's easy to remove from the litter pan and change! I love the fact I don't have a mess when changing,  I just take it out and put the cover on it and in the trash it goes! My cat has no problems with the Crystals and likes using the litter!