Hi Benjammin.
The most extensive review/info on the MiOx can be found here:
http://www.prolitegear.com/cgi-bin/prolitegear/pl_msr_miox.html
The reason the MiOx does take crypto out as opposed to regular chlorine is that the MiOx creates hypochlorous acid and ozone in addition to the chlorine produced which kills off this particular nasty in max. 4 hours (worst case water. Nevertheless, stick to the 4 hours to be sure)
Also, someone mentioned using sea water for the brine....
BTDT, won't work ! Not salty enough <img src="/images/graemlins/mad.gif" alt="" />.
The url above also explains why.
Blast, thanks for the info on the DIY MiOx <img src="/images/graemlins/laugh.gif" alt="" />.

Hope this helps.

Pharaoh.