Compost toilets reduce water usage, prevent pollution and produce fertiliser from a waste product. Built properly they can be attractive, family friendly and low maintenance. This DIY guide contains everything you need to know about building a compost toilet, plus proprietary models, decomposition, pathogens and hygiene, use and maintenance, environmental benefits, troubleshooting and further resources. A well-designed composting toilet system is at the pinnacle of sustainable sewage treatment. 126 pages, £11.95. Buy from our partner, the Centre for Alternative Technology.