This episode outlines various origins of drinkable water.Ā
We identifyĀ fresh waterĀ as the simplest source to purify, requiring only filtering and sterilization.
In contrast,Ā seawater desalinationĀ is presented as the most energy-intensive and costly method.
Finally, the text notes thatĀ wastewater treatmentĀ is a multi-stage process that demands less energy than making seawater potable.
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