Feline Pine Original Cat Litter, 20-Pound Bag

It is the most economical litter I have ever used. I only put a layer of litter in the pan that will cover half the pan. As the cats use it, it turns to sawdust. When its all dust you dump it. It expands when it gets wet and also kills the urine smell. If you use very much it will get all over the house, so less in the box is better. The best part is one bag lasts a long time if you use it right. I have 3 cats using one box and I put in one pooper scooper scoop of new litter in the box, it lasts 3 or 4 days before all the litter has turned to sawdust and filled the box half way up. One bag lasts for months.

I like Feline Pine and have used 3 or 4 boxes of it. There's nothing like the smell of pine sawdust. It really freshens the room in a natural way and contains odors well. If odor is your big complaint, you should give Feline Pine strong consideration. 

However, the sawdust is extremely fine and light. Your cat's paws will pick it up and track it outside the box every time they leave it. In my experience it will be all over the room where the box is and even beyond. Worse, once it's on your furniture, it's very hard to brush off. Imagine very fine particles of sawdust: they get stuck in the fabric of your furniture and need to be vigorously brushed/vacuumed out. My house has hardwood floors. Perhaps this effect is easier to contain with carpets.

The clumping is okay but not fantastic. After a while the catbox is a gravel pit of tiny clumps too small to pick up with the scoop. Clumping in other litters is harder and easier to clean.