Vast wetlands: Wetlands filter water naturally by removing sediment and heavy metals.

LiveStrong.com: How Nature Purifies Water (and How to Do It Yourself)

Vast wetlands: Wetlands filter water naturally by removing sediment and heavy metals.

LiveStrong.com: How Nature Purifies Water (and How to Do It Yourself)

LiveStrong.com: How Nature Purifies Water (and How to Do It Yourself)

LiveStrong.com: How Nature Purifies Water (and How to Do It Yourself)

LiveStrong.com: How Nature Purifies Water (and How to Do It Yourself)

LiveStrong.com: How Nature Purifies Water (and How to Do It Yourself)

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