Sun-Mar Compact Composting ToiletThe Compact composting toilet is an elegant, low profile unit with the looks to compliment any bathroom. Sun Mar engineers designed this low profile toilet by developing and patenting a new variable diameter Bio drum which is small at the front and large at the rear. The Compact has a built in heating element to help evaporate liquids, and a fan to provide odorless operation. The Compact is designed to be used when you have tighter spaces.