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A dry toilet is a toilet that operates without flush water, unlike a flush toilet. The dry toilet may have a raised pedestal on which the user can sit, or a squat pan over which the user squats in the case of a squat toilet. In both cases, the excreta falls through a drop hole. The urine and feces can either become mixed at the point of dropping or stay separated, which is called urine diversion. Dry toilets do not produce sewage. Many types of toilets without a water seal exist. These types of toilets do not use water as an odor seal or to move excreta along. For example, from simple to more complex: a bucket toilet , a tree bog or arborloo , a pit latrine , a vault toilet , a container-based toilet, a composting toilet , a urine-diverting dry toilet , and incinerating and freezing toilets.