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What are the naturally available and cost less materials that can be used to purify water?

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what are the best and economic methods to treat and purify the water?

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  1. Sand and gravel


  2. Chlorine gas dissolved in water is very cheap and is used by most water purification plants.

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  3. the cheap and best solution is to dissolve small quantity  of alum in water ......

  4. Lime stone pebbles. Nature uses them a lot in spring wells etc.
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