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There are two type of water filtration systems, apart from those uses in home. Small scale and large scale water purification. After water becomes free of visible impurities, we add chlorine to it. It is extremely economical and kills almost all microorganisms (Except ova and cysts, witch are already removed by good water purification. ) with in an hour or so. There are theoretical disadvantages of chlorinated water, like it causes cancer, witch is not true when used in recommended concentration. Best advantage of chlorine is that is is active for any length of time (say one year.) and will kill the microorganism if re contamination occurs. There are no supporters of chlorine, as it is very economical and no body is interesting in marketing it. For chlorine to act water must be free from organic substances.

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