DIY Emergency 5 Gallon Water Filter / Filtration System for $35 SHTF Bushcraft Berkey Royal Doulton
This video shows how to make and use the home made Berkey type water filtration system. This one is made […]
disaster
Michael Pritchard: How to make filthy water drinkable
http://www.ted.com Too much of the world lacks access to clean drinking water. Engineer Michael Pritchard did something about it —