In a full blown shtf hot zone the only way to have clean water is having it already stored or bugging out of the area (unless you are Oprah rich and have a state of the art bunker complete with filtering systems, power systems, 10 yrs worth of food and water, a doctor on staff, a cook, a maid). To stay is to die. Japan should give you an example of radiation and the downfalls of having it contaminate an area. 200 miles in another direction might be clean, are you going to stay?
I'm talking about filtering my house water right now, would also work in an shtf scenario depending on what it looks like.
But with the EPA/FDA raising the limit because it suits them to do so rather telling everyone there is a danger, I'm not buying it. They are playing the odds, but my health is in the balance. So I dont think so.
This isnt background radiation, and if this was from some dirty bomb by a terrorists then the country would be looking at this very differently. Ceasium, Strontium, Plutonium, Iodine 121,122 doesnt play favorites, its nuclear waste. Japanese or otherwise.
Just so long as you remember the problems with focussing the radioactive material.
Just ask those who were living at Nagasaki and Hiroshima in 1945.
Remember the critical mass!
I'm not sure where you are going with this, I understand as I said this isnt a silver bullet, and might even be a long shot. My thinking is simple, most of these elements are positively charged, Zeolite is a negatively charged element so they attract each other. Also if Chernobyl is to used as example then this is what is available and been tried and proven to work.
Also, I'm not going to put this filter under my bed or anyplace where I spend any amount of time. This is probably going to go someplace as remote as I can get within reason for it to work.
As I said, if its in the filter then it was on its way in to begin with, drink it cook with it, coffee etc.....
This is all pretty much playing the odds, but at least I have a better idea of what these odds are.