ThisTooWillEnd t1_jcljs8p wrote
Reply to comment by saywherefore in If UV radiation is used to disinfect and sterilise things then why isn't everything the sun touches (your skin, the sidewalk etc) sterile? by Critwhoris
Importantly, the water must be very clear for this to work. If you just put some dirty lake water in a bottle and put it in the sun, the water will still be both unclean and full of life. Filter first, then UV treat.
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