I'm guessing you already know about bentonite clay as a detoxing agent, I use montmorillonite clay as it's very similar (and montmorillon is not actually that far from where I am as some added entertaining coincidence), and I'm guessing you know about Berkey water filters. I looked into water filters a couple of years ago and they were literally the only company that actually had their filters tested by a third party and published the results. Unfortunately I think they are unavailable now as big pharma had them shut down recently.