Many bush water sources and streams have become infected by parasites and pathogens due to unsatisfactory methods of human waste disposal. People are now advised to treat all water with caution. The washing of clothes, utensils, bodies or hands always should be at least 50 m away from any water source. Even biodegradable detergents, toothpaste and soaps harm fish and waterlife. Scatter all used water at least 100 m from streams and lakes, so that it can filter through the soil before it returns to a water body. Use gritty sand and scourers to clean dishes instead of soap. Do not discard food scraps into any water supply as it is unsightly and off-putting as well as unsanitary. Chapter 28 gives more information on safe drinking water.