There are toilets that do not use water to take the waste away, but have a dark chamber without contact with the environment, where they are transformed by natural processes in organic compost for the fertilization of orchards and gardens. There are several different models, but everyone represents a complete paradigm in use of health and sanitation, and provide an effective experience of integration of human beings to the cycle of nutrients the way nature does, in situ and without creating waste or tailings.

Ideal for areas where water is a resource that should be used sparingly because it is scarce or expensive, or for sites that offer no possibility of sewage treatment or budget constraints. They are effective, practical and very educational.