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What best determines the health of a lake used as a source of freshwater?

User Omatt
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The number of pH, the closer the number it is from 7 the more fresh it is. If the pH is lower than 7, then it's acidic, and if the pH is higher than 7, then it is a base
User Dsissitka
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temperature and pH yup yup
User Roland Buergi
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