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Speaking of which, always keep your clay & charcoal in airtight packaging (so that it doesn't get 'used up' soaking up toxins from the air :)
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Oh Boyd! I sometimes leave the IF#2 ziploc half-opened! I suppose that applies to Activiated Charcoal too. Is there anything to watch out for AC. I just get it from http://www.abnat.com/activated-charcoal-powder.htm
You know Mountain Rose says its clay is naturally quarried and *untreated*. It definitely doesn't sound as fancy as the 4-step Purification Process claimed by Yerba Prima. In fact, it almost sound like it's not food-grade... Nevertheless, MRHerb is the one in IF#2, the one I'll trust...