cat litter is the best i started using it 2 months ago and ive still got half a bag its amazing stuff tottaly stops the smells and is cheap!! woop go cat litter!! hehetwitch said:i use yesterday's news cat litter. if you buy from a feed store you can get a big 30 lbs bag that will last me (having 6 rats in a 2 tier chinchillla cage) a little over a month for $15 canadian. which is about half of what i would pay anywhere else. especially pet stores-- the inflation on their stuff is nuts! in any case, i find yesterday's news is the best to use. the aspen i find doesn't absorb the odour as well and the carefresh i find doesn't last as long (more expensive for less).