Thanks, for that info. It is an important issue, considering we will be stepping into an age of scarcity of clean water innour near future, on this globe.

I know it's close already, but it could get much worse for people of western worlds who habe no immunity for dirty water or knowledge to clean it up!

This is next thing I want to learn about in-depth. In Puerto Rico we drank rain water filtered through a Burkey gravity clay filter.