Perhaps the EPA's certification program for water purification wasn't really set up to test a product like this? It seems to be a rather novel product for personal water purification.

Same reason why the Steripen isn't "certified"--not that it doesn't work, but the EPA doesn't have a test for a personal UV purifier like the Steripen.

Do may wish to do a search on using "alum" (hydrated potassium aluminium sulfate or potassium alum) as a flocculant. There are some youtube vids on its use in water purication. An alum block crystal can be a helpful bit of kit; stypic, anti-microbial, etc...

http://en.wikipedia.org/wiki/Alum

Possibly because it has been in use (the technique, not the product) for years. When I was in the Corps of Engineers in the late 60's we were using it. The WHO and the Wilderness Medical Society have been suggesting it as a possibility for years (I don't know how many). I have used alum for reducing turbidity in nasty places for a long time, always as a precursor to other techniques. Used in dirty water before filtering it makes the filter last LOTS longer. Also makes the chlorine work better. Use a normal amount, not several times that much. Very obvious if you use the detection strips from a MIOX system.

Respectfully,

Jerry