I recently switched to crystal litter (usually the brand 'amazing cat') it's a little more expensive (8lb bag is around $10 at local stores) but it seriously is amazing. I just have one cat, but with standard litter I would notice the smell and have to change the entire box weekly, even with daily scooping. but with this stuff one go lasted for about 1.5 months, and even then it didn't smell, the crystals were all pretty much yellow so I changed it XD.
I just came back from petco and they didn't have that brand, so I got petco's crystal litter. is it just as good?