good morning children in this lesson we will learn about methods of cleaning water water is essential for all the living things we cannot live without water right we cannot drink polluted water as it contains harmful bacteria which can cause many diseases the insoluble impurities can be removed by a few methods first let us look at a simple process called sedimentation in this method we keep the water undisturbed for some time the insoluble particles settle down at the bottom leaving the clear water on the top this process is called sedimentation and the insoluble particles settled at the bottom are called sediments the clean water obtained from the earlier process of sedimentation is then poured into another container the sediments are left behind this is known as decantation some insoluble impurities keep floating on the surface of the water how do we remove them let us see another method for it the impure water is poured into another container through the filter cloth so what is filter the filter has tiny holes through which water passes but impurities are left behind this process is known as filtration how do we remove soluble impurities soluble impurities like salt cannot be removed by the method shown earlier like sedimentation or filtration as they get dissolved in the water let us see a method to remove soluble impurities in this process we boil the water the water evaporates to become water vapor the salt is left behind this process of changing water into water vapors is called evaporation now how do we collect the water vapor the evaporated water that is water vapor is then cooled out or condensed in a jar to get pure water this process of evaporation and condensation is called distillation distillation consists of two steps step number one evaporation in this step the water is evaporated into steam in a distillation flask step number two condensation in this step the water vapor is converted into water by passing it through the condenser condenser is kept cooled by circulating cold water water formed this way is purest and is called distilled water boiling is another simple method to remove the germs from the water do you know how do you get clean drinking water at home the water reaching our homes is first cleaned in town water works before it is applied to our homes the following processes are used sedimentation water is first allowed to stand enlarged sedimentation tanks where the large insoluble particles settle down at the bottom filtration water is then filtered through sand beds where small insoluble particles are filtered chlorination chlorine is added in water to kill the germs here you can see coordination process in a town water supply plant the purified water is then carried in the underground pipes and tabs to our homes the water which is suitable for drinking is called portable water so a lot of work needs to be done before the potable water reaches our home as we saw for removing suitable impurities we can use sedimentation decantation and filtration methods for removing soluble impurities we can use the distillation process what are the ways of purifying or cleaning water at our homes here we can see methods of cleaning water used in our homes the simplest method is by boiling water purification is also done by adding some chemicals like chlorine to kill the germs nowadays various small filtration machines are also used at home to purify the water for drinking water is very precious for all living things we should not waste water
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