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33 votes
Where is the water source you would need to filter water?​

User CalvinChe
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1 Answer

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6 votes

As water travels through the ground, it gets filtered in a natural way, much like how it is in the filtration process where it is passed through sand. Water also gets naturally purified as it flows through some kinds of ecosystems, especially in the wetlands.

User Amit Suroliya
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