This common misconceptions covers Common Misconceptions within Water Treatment for GCSE Chemistry. Revise Water Treatment in Using Resources for GCSE Chemistry with 20 exam-style questions and 15 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 9 of 13 in this topic. Use this common misconceptions to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 9 of 13
Practice
20 questions
Recall
15 flashcards
⚠️ 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.