Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Doesn't clump pee

I'm confused at all the great reviews of this product. I've used both the single and multiple cat varieties of World's Best Cat Litter and neither one does a good job of clumping pee (sorry this post is sort of gross, but such is the nature of cat litter). The pee just breaks up and the litter becomes saturated with it until it's so smelly and gives off so much ammonia that you have to change it before the litter has actually run out. The only reason I gave it two stars is because it's biodegradable.For those of you who want an eco-friendly (biodegradable) cat litter that works well, try Swheat Scoop (sp?). It clumps well and helps control smell...I actually prefer it to any other cat litter, eco-friendly or not.