Has anyone here any knowledge how the ancients purified/filtered water?
I am thinking of explorers and ancient cultures. I do recall hearing on a shortwave radio program how one outdoor person claimed that the Japanese in WWII used some kind of leaves/plant herb to put in water to purify it and also I remember reading somewhere how the ancient Egyptians used different pots and strips of cloth to seep clean water from one pot to another using capillary action.
Have not been able to find much info on this. Any history gurus or jungle travellers here who can shed some light on this topic? How explorers or native peoples filtered water for drinking?