WATERLESS TOILETS. There many forms of toilets that do not use water. Anaerobic systems, such as out-houses and methane digesters function on. All Ecoflo systems are odour and chemical free as well as being completely waterless. Ecoflo composting toilets provide a hygienic method of recycling human. Shop our selection of Waterless, Composting Toilets in the Bath Department at The Home Depot.