Alright. First off, I live in memphis
where they put a bunch of chlorine in our
water to hide its crap. Anyways...
He did electrolysis.
He most likely took an electrode made out
of a material that decomposes on contact
with certain chemicals.
Think of it like chrome plating, they take
the material, put it in a special liquid
that it reacts with, put electricity
through it, and then the stuff tries to go
from the positive to the hot electrode.
If you don't live in a clean country, I
personally would opt for something. Not
necessarily what he had to offer, but some
sort of filtration system for the tap
water you drink (if you do).
Bottled water should be fine if thats all
you drink. That stuff is processed.
Remember that cooking a substance you put
tap water doesn't necessarily get rid of
all the "bad stuff". Take the new
carbon
nanotube/buckyball scare
also, please note this are the words of a
high-schooler, so i'm not going to
guarantee anything I say.