Final year project Solar still- portable water What is solar still? A solar still distils water with substances dissolved in it by using the heat of the Sun to evaporate water so that it may be cooled and collected, thereby purifying it. They are used in areas where drinking water is unavailable, so that clean water is obtained from dirty water or from plants by exposing them to sunlight. Working principle of solar still The sun's energy heats water to the point of evaporation. As the water evaporates, water vapour rises, condensing into water again as it cools and can then be collected. This process leaves behind impurities, such as salts and heavy metals, and eliminates microbiological organisms. The end result is pure distilled drinking water. The purification process involves two main processes including Evaporation Condensation Uses Solar stills are used in cases where rain, piped, or well water is impractical, such as in remote homes or during power outages.[1] In subtropical hurricane target areas that can lose power for days, solar distillation can provide an alternative source of clean water. Advantages Provide a maintained pH level which is very close to natural water as compared to other water purifiers. very cheap there is no cost of extra energy once you’re solar still is manufactured you will get benefits without extra cost. Less hazardous because there is no any mechanical equipment. Works on free energy which we get from the sun hence there is a record of Co2 emission. Water taste is claimed to be very good if we compare it with other purifiers Disadvantages The solar still doesn’t break down the bacteria’s. In solar still boiling process of water does not occur. Sun still produces a low quantity of water. It required time very much to produce less quantity of water. Large top glass may attract the bugs and insects