Why drinking water is rarely actually pure
In short: Most people assume tap water is pure, but it is actually carefully engineered to be potable. This video explains the chemistry of transforming raw river water and salt water into safe drinking sources.
Potable water is defined by its safety for human consumption rather than chemical purity. To meet this standard, water must fall within specific pH ranges, contain minimal dissolved substances, and be free of harmful microorganisms. The process begins with sourcing from surface waters like rivers or groundwater aquifers.
Treatment involves physical filtration to remove solids followed by sterilization using chlorine, ozone, or ultraviolet light. For arid regions, desalination is used to remove salt from seawater via distillation or reverse osmosis—processes that are effective but notable for their high energy demands and costs.
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Sources
- Summary by Intellect · source: GCSE Chemistry - Potable Water - Treating Freshwater | Desalinating Seawater (2027/28 exams)
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