If you think our previous review on Fifi Cat Litter with Active Carbon was awesome, presenting Fifi Litter with active carbon and silica. It is a mouth full to even mention it. Fifi Cat Litter with Active Carbon and Silica is the best cat litter for multiple cats making it probably the worlds best cat litter. In this cat litter review video, we will see what is the added benefits of adding silica into the already awesome cat litter. Best clumping cat litter? Best cat litter for odor control? Good tracking cat litter? Watch the full video to see what this Premium cat litter is capable of.