2026-11-01
Time Traveler's Guide: When Drinking Raw Water in Ancient Times Could Kill You, How to Build a Charcoal-Alum Filter and Life-Saving ORS
[Time Traveler's Core Tech Reconstruction · Episode 05] If a modern person woke up in pre-industrial history, the deadliest threat in the first 72 hours wouldn't be swords or bandits—it would be acute dysentery or cholera dehydration from a single sip of river or well water. Grounded in colloid chemistry, slow-sand filtration, and intestinal SGLT1 sodium-glucose cotransport physiology, here is how to build a 3-layer alum-charcoal water purifier and mix Oral Rehydration Salts (ORS) using coarse salt and maltose.
