This is a 10 min video of the river water demo in KL and Penang, Malaysia of the Seagull IV water purifier from General Ecology USA.
http://naturepure.blogspot.com
Seagull 4 is a EPA certified micro-biological purifier, clinically proven to remove 99.99999% of viruses, bacteria, chemicals and heavy metals, up till the last drop.
Do not be confused by water filters or fancy so called high technology units that are not clinically proven.
Clinical tests done at the University of Arizona, USA and Institute Pasteur, France.