Thanks for that. At least the web page exists. Seems a lot of effort for a hoax.
Would still need to see an independent test by a reputable body. And a source for his quote saying chemical purification doesn't work. Which is not what the scientists tell us.
But him being a hype artists doesn't necessarily mean the product doesn't work.
Least if it exists it will be a filter that makes sense. With others you still have to chemically treat the water, so why not just use chemical treatment in the first place?
And inside the bottle is the right place for a filter. Relying on having scrupulously clean hands and not a drop of water being splashed or dripping into the container never sounded that easy in the wilds.
Simon