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Learning Curve - Litterbox Comics
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I remember hearing the reason DI water may not necessarily be potable js it's only free of salts/ion and may still have microorganisms or other biologically dangerous contaminates.
ETA: https://peerj.com/preprints/181.pdf
There's a difference between potable and healthy over a long term.
Also, what an excellent example of "community" knowledge basically being a superstition telephone game this thread is.