Multiple choice

Which of the following is used to clean water in modern filters?

  1. Iodine

  2. Chlorination

  3. Ultraviolet rays

  4. Ceramic, used as filter

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ultraviolet rays are used to clean water in modern filters. Most ultraviolet purification systems are combined with various forms of filtration, as UV light is only capable of killing microorganisms such as bacteria, viruses, molds, algae and yeast. UV light generally has no impact on chlorine, VOCs and heavy metals.

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