I really wish I could give these litter crystals 100 stars! I use these crystals in my regular cat litter that is in a regular litter pan. I have literally tried everything that I could to keep my cat's litter odor to a minimum. I received these crystals and let me tell you, you can not even tell that a cat lives here! I am in love with these crystals because they really do eliminate the cat urine and feces odor like no other product out there. I poured just enough to cover the bottom of my cat's litter pan and filled the rest with our regular litter. You don't have to be a chemist to use these litter crystals, you can pour a little like I did or use the whole bag. It's really user preferred. I will never use my favorite kitty litter again without these crystals! I recommend anyone with a kitten or a cat to buy these crystals because you won't regret it!