How to use a semi-permeable screen ...
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Semi permeable screen is used for purification of water or any other liquid by process of Osmosis it is used between container on a side of it there will be pure or less contaminated / concentrated water and on the other side there will be highly conctaminated / concentrated water and as we know water flows from region of lower concentration to region of lower concentrate water will flow in pure water section leaving impurities behind .
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