Common Misconceptions

⚠️ Common Misconceptions

Misconception 1: "Potable water is the same as pure water"

This is one of the most common exam mistakes. Potable water is safe to drink but is NOT chemically pure. It still contains dissolved minerals, salts, and sometimes small amounts of chlorine. Pure water (H₂O only, with nothing dissolved) would taste flat and bland. Potable water meets health safety standards — it does not need to be chemically pure.

Misconception 2: "Filtration removes all bacteria"

Sand and gravel filtration removes most suspended particles and some microorganisms, but does NOT reliably kill all bacteria and viruses. That is why chlorination (or UV treatment) is a separate, essential step that comes AFTER filtration. Filtration clears the water physically; chlorination sterilises it biologically.

Misconception 3: "Desalination is the same process as normal water treatment"

Desalination removes dissolved salts from seawater, which is a fundamentally different challenge from treating freshwater sources. Normal water treatment removes suspended particles and microorganisms; desalination must also break the chemical bonds holding dissolved ions in solution. This makes desalination far more energy-intensive than standard water treatment.