You can train your cat to use the toilet. By doing this it will save you time and money. There will be little or no mess. Once the cat has been trained to go into the toilet, you will be able to eliminate the cat litter and the smell associated with cats. You will need a few items to get you started. Aluminum foil, a tray, and cat litter preferably flushable kitty litter.
You will not have to clean the litter box anymore and will save money on not having to buy the litter any more. You need to decide which toilet in the house you will use. In addition, what toilet in the house the cat will use. If you have two toilets it maybe easier to train than if, you only have one toilet in the house.
You will have to use an aluminum tray to put on the toilet. With two toilets in the house, you can leave the tray right in the toilet and not have to remove it when you need to use the toilet in the house. If you have only one toilet, it is not that convenient to share with your cat. You will just have to remove the tray whenever you want to use the toilet. Be sure to leave the seat down and lid up for the training period.
Leave a note on the toilet for guests so that your cat does not make a mess on the floor if the lid is down. Replace the cats litter box with an aluminum-cooking tray. The aluminum tray should be the right size to fit in the toilet. The seat lid should be able to close so that the seat lid holds the tray in place. Remember do not close the lid. The results may be less than attractive. Start moving the tray closer and closer to the toilet that the cat will be using. Be sure not to move it when the cat does not know it is there.
Once the litter tray is in the bathroom put a something about an inch thick under the tray. Magazines are a very bad choice for this. The magazines are slick and the litter box may fall. Continue to raise the litter box about an inch every day until the litter box is the same level as the toilet. The cat will be able to just step into the litter box at first. As you raise the litter box, the cat will have to jump into the box. You may want to secure the box so it does not move when the cat jumps into the litter box.
Let the cat know its there by scraping its claws in the tray. If there is, no litter in the tray the cat will be confused and will not understand what is going on. After the tray is in the toilet, you can use cat litter, which is flushable. If you use flushable kitty litter, you will have little or no mess to clean up.
Continue to leave the tray there for about 3 weeks. During this time reduce the litter in the tray and make a 1" diameter hole in the tray. Every week, make the hole 1/2" bigger. If the cat messes on the floor then the cat is trying to let you know that you are moving to fast. If your cat is heavy, try using two trays to hold its weight.
You may want to wait to train your cat until it is at least 6 months old. Cats younger than that cannot balance well and may end up being a big problem. Do not get discouraged as the process could take up to two to three months. The cat will start with two paws on the tray. As the hole you put into the tray gets bigger (by 1/2" per weak) it will move a third leg to the toilet seat. Finally, the cat will have all four legs on the seat. Some cats cannot grip the seat very well. If the cat is the only one to use that toilet, you might put some kind of tape it can grip to on the seat lid.