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Sand Filters

Sand filtration systems work by incorporating several different techniques: First there is the obvious filtering effect of passing the water through extremely fine sand. This results in a mechanical exclusion of particles larger than the grain size of the sand. This can result in a very effective clarifying of the water. It also increases the residence time of the water in the filter as it passes very slowly through the

Solar Stoves with Temperature Indicator

Solar Stoves Can Save Lives Over a billion people world wide lack any safe drinking water. As a result almost two million children world wide die each year of diarrhea, and over 4 billion people are sickened by contaminated drinking water. In some area of the world 40% of all hospital admissions are due to diarrheal disease. Dangerous organisms can be killed by Pasteurization at 160 degrees F. Simple solar