Originally Posted by chrisx

In the old days, we drank water from a fast moving stream. Above any human settlement. Moss or green plants in the water are natures filter.



Portable filters do not remove DDT, or lead, or insesticide, or on and on.


https://www.uswatersystems.com/what-...filters-remove

I often use a cheap filter and a steri pen. I dispose of the filter out, not store it.




Flickr
Central American water source. The cold harsh reality.
I noticed that the coca cola company sells bottled water all over the Americas. They have a much better filter than any one of us does. One dollar for 5 liters or there abouts.

Guatemal city tap water comes from down stream of here

I know a guy that makes water filters. He knows so much about filtering water, that he is dehydrated most of the time.