The document proposes flushing toilets with air instead of water to conserve water. Using air would save over 15 liters of water per flush compared to standard toilets. For example, a boarding school of 500 students could save over 1.8 million liters of water per year. The document also suggests collecting organic waste and using anaerobic digestion to produce biogas, with a boarding school of 500 people producing around 10,000 liters of biogas per day. Implementing a system that uses air flushing and anaerobic digestion could help facilities like schools, hotels and prisons reduce water and energy use.