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Name 2 alternatives of purifying drinking water:
Ozone and UV light
Why is using ozone a good thing?
It's a strong oxidising agent, which makes it great at killing microorganisms.
Why is using ozone a bad thing?
It's expensive to produce and its short half-life in water means that treatment isn't permanent.
Why is using UV light a good thing?
It kills microorganisms by damaging their DNA
Why is using UV light a bad thing?
It's ineffective in cloudy water and won't stop the water being contaminated further down the line.