ALAN SIRULNIKOFF / SCIENCE PHOTO LIBRARY ALAN SIRULNIKOFF / SCIENCE PHOTO LIBRARY
Composting toilet. Decomposition section of a composting toilet. Composting toilets use bacteria and heat to control the decomposition of human excrement. The excrement is passed through the three sections seen, emerging as an odourless humus material that can be used as a fertiliser. Such toilets do not require the large amounts of water in conventional flush toilets. Photographed on Valdes Island, British Columbia, Canada.
Model release not required. Property release not required.