Sample Answer: 1
The figure describes the operations of a water filter installation intended to obtain clean and safe drinking water. This system entails two major components, one for water filtration and the other for storing water that is free of impurities, namely a plastic barrel and a storage drum, respectively.
The process starts with the water being poured inside the first plastic barrel, which contains three built-in filters arranged in vertical order. The highest surface layer comprises sand, which captures the smallest particles and impurities. Under this layer is a charcoal layer, which assists in the removal of harmful impurities, smells, and chemicals. The bottom surface layer is gravel, which, in addition to supporting structure, also aids in initial filtration by collecting larger wastes.
After these layers, the tangerine-coloured water flows through a pipe that leads to the storage tank. At the storage tank, the water is already filtered and can be accessed through a tap. During the water filtration process, a polythene cover fits tightly over it to avoid contamination from the external environment.
The method is cheap and practical and is free of electric or mechanical parts, which ensure the safety of water for drinking. Such kinds of systems can be recommended to regions where market technology that has a faster filtration rate is lacking.
Sample Answer: 2
The illustration below maps the steps of turning dirty water into clean, drinking water while outlining the concept of a water-filter system. The system comprises two primary components: a plastic barrel used for water and a storage drum that collects the water for the use of people.
The process of filtration starts where water is filled into the barrel of plastic. A total of three filtration media are present within the barrel. The head layer is composed of sand; sand traps minute impurities and particles. Under the layer of sand is a layer containing activated charcoal, which is intended to capture impurities, smells, and chemical substances. Underneath the barrel is the gravel, which forms the bottom layer to help hold the larger debris particles and strengthen the sections above.
After the water has been filtered through these layers, it passes through a pipe connecting it to the storage drum. For safe handling purposes, this drum has a tap, which is used to access the purified water. The barrel has a tapered plastic head, which is fitted to protect the whole system from foreign material.
What is more, this simple and effective design offers an excellent way of providing… clean water from dirty water, even in regions without modern filter systems.