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A method of purifying water involves the use of microorganisms. In this method, water is sprayed onto a bed of stones where the micro-organisms live. These organisms feed on the pathogens in the water and thus free the water from harmful pathogens. This method is called the

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A method of purifying water involves the use of microorganisms. In this method, water is sprayed onto a bed of stones where the micro-organisms live. These organisms feed on the pathogens in the water and thus free the water from harmful pathogens. This method is called the






 
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