Automatic Litterbox Central

I didn't buy Ammo-Carb but found some loose carbon granules at Walmart. How much carbon should I put in the drawer? Thanks.

I also started using carbon pellets in the bottom part of the LR - it make a huge difference in the smell. Just put the pellets in the container under the collection bag and also a bit in the the bag each time you replace it.

If you want to re-use the carbon left over in the bottom, you can always rinse it in water (if it needs it) and let the sun bake it dry for a few hours. This will recharge the carbon enough so it can be used two or three times to save a bit of money.