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Appearance is not an accurate indication of potability [ drinkability -- fit for human consumption ].

For example, a powerful poison can be a clear, transparent and sparkling liquid in a glass, looking exactly like a glass of refreshing water. But what a difference healthwise !!!

The above answer does not tell much about the health of an ecosystem, although it is important to remember when looking for a source of drinkable water. A healthy freshwater ecosystem will have little pollution, few invasive species, and an abundance of both plant and animal species. The presence of leeches usually indicates good quality water.

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