The Realist directed my attention to these two videos. The first examines pond water under a microscope before and after boiling. As the author notes, the boiling doesn't remove debris (dirt, etc.) in the water, so you will want to filter with a cloth, but the boiling does destroy the microorganisms.
CloseIntel (1-1/2 min).
In the second video, the author does a before and after examination of water after going through a Life Straw. The author describes finding some debris after pumping it through the Life Straw but did not see any evidence of microbial life.
CloseIntel (2 min.)
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