answer: rainwater might not be very safe to drink. either due to circumstances around how the water is collected and stored to other pollutants that accumulate in the atmosphere that rainwater may carry.
https://www.cdc.gov/healthywater/drinking/private/rainwater-collection.html
https://www.livescience.com/is-drinking-rainwater-safe
>How does this process purify it and make it safe for drinking after falling down as rain?
it doesn’t so much as just disbursing contaminants to the point that they’re comparatively less harmful than other water sources. filtered water is still going to be safer to drink.
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