I use the Catsan Ultra clumping litter for years and I must say it is absolutely the best cat litter ever. It has a top-notch suction, thus there are absolutely no unpleasant odors and clumps totally good and the lumps are so strong that they can be removed easily and conveniently with a shovel. I've tried a lot of litter, but none were as good as this. Highly Recommended!