Biodegradable Cat Litters
Over the past few years, organic, biodegradable cat litters have become increasingly popular, as they have certain advantages over other types of litters. For one, they're more eco-friendly, as they're made from all-natural cat litter substances, which can include materials like wheat, corn, grass, walnut shells, pine or even recycled newspapers. Because of this, they are flushable and can even be composted. Another plus is that biodegradable cat litter typically consists of larger-grained pellets, which in turn makes for acceptable kitten litter, since kittens can't ingest the particles. Many biodegradable cat litters come in clumping varieties. Clumping Clay Litter
The most popular types of kitty litter are clumping clay litters, one reason being the price; they're drastically less expensive than many of the other types available, such as natural, biodegradable cat litter. Most are effective at controlling odors -- a key concern for owners when choosing a litter -- and they make cleaning out the litter box much more painless. However, most consist of fine-grained clays, which can be dusty or even tracked throughout the house by a cat. Fine-grained cat litter isn't appropriate for kittens under 3 months old, as the small particles can get into their respiratory tract. Clay-based cat litter isn't biodegradable and should never, ever be flushed down the toilet for disposal. Crystal Cat Litter
Cat owners praise crystal cat litters in user reviews on online retailer sites, but experts typically dislike them because they consist of jagged, crystalline particles that can be rough on cats' feet. On the other hand, many pet owners swear by crystal cat litters because they're extremely absorbent -- thanks to the sodium silicate or silica gel used -- and don't need to be changed as frequently as other types of kitty litter. One caveat: When the crystals reach their absorbency limit, you can expect a pool of urine in the bottom of the cat litter box.