According to the MSR website the MIOX unit uses platinum electrodes for both the anode and cathode. These shouldn't release any ions under these conditions whereas the carbon/graphite *might* drop something off the anode. I'm not worried about toxicity but I am concerned about the carbon anode creating different oxidative products.

Hmm, 1 mL of a saturated NaCl solution, 6V DC, I need to look up the current put out by the three batteries. I wonder if a chlorine test kit for a pool would be able to help me measure the resulting chlorine strengths...

This could be a fun weekend. Note to self, review first aid for chlorine gas inhalation with Kuovonne...

-Blast