First I tried the regular catalyst. Both me and my cat hated it because the smell was terrible and super strong. The wood varnish smelled smelled up my entire house. She wouldn't use it. Catalyst was kind enough to not only give me my money back, but gave me a free bag of the unscented. My cat uses it! Score! I love how light weight it is and it clumps really well. Don't bother getting the regular one, just go for the unscented