There are a few things you can do to keep your wood pellet litter box smelling good. First, it’s important to have a consistent cleaning routine. Sift sawdust on a regular basis every day and remove solid waste immediately. You should also change pellets every month, and wash the litter box with hot water and a soap when you clean it. Finally, plastic litter boxes tend to absorb odor over time, so replace them every six months or so.