Spencer; OK I understand it now. I was under the impression that perhaps through heat, it evaporated the litter! Although, living in a rural area, I do not purchase any type of commercial litter product, but instead use creek bottom sand. There is plenty of that around here, and besides, the price is right! My homemade 24" x 24" litter box is made entirely of wood. I have found that a good washing out with a nozzelled garden hose, and then leaving it in the Sun for a while cleans up any odor that might persist. Then I put new, clean sand in it -about 4 gallons worth and truck (pull) it back into the house's bathroom. I'd imagine that the whole thing weighs around 40 to 50 lbs when full.

.........wayne