David C Breeden wrote "Ben-And FWIW, when I've "standardized" bags of meta,
I've found actual levels more like 36%. And it'd be less if you use hot
water or water with chlorine (so I've been told--does anyone know for sure
if chlorine reacts with SO2) to dissolve your meta."

David and others interested in SO2 reactions.
Here is an excerpt from an article on the subject. A.J.DeLange is a well
known scientist in beer brewing circles. A lot of beer makers use K Meta to
rid local water of chlorine and chloramine.

bill frazier
olathe, kansas usa

Date: Tue, 08 Apr 2003 14:25:19 +0000From: "A.J. deLange" <ajdel at
cox.net>Subject: Chloramine/ZincFor Doug: The reaction between chlorine and
bisulfite is:S2O5-2 + 4Cl + 3H2O --> 2SO4-2 + 6H+ + 4 Cl-With mono
chloramine it is:S2O5-2 + 2H2NCl + 3H2O --> 2SO4-2 + 2H+ + 2Cl- + 2NH4+In
either case the bisulfite is oxidized to sulfate and the clorine, while it
is not "removed", is reduced to chloride ion.This method of removing
chlorine has been used by aquarists for years (though they use thiosulfate
rather than bisulfite). With the advent of chloramine they must be sure to
have an effective means of removing the ammonium ion/ammonia that is
produced. It's a simple thing to check out. Draw a glass of stinky
chlorinated or chloraminated water and drop in the corner of a Campden
tablet. The chlorine smell will be gone very quickly (to be replaced,
perhaps, with a sulfur dioxide smell so only use the tiniest bit of the
tablet - one tablet should treat 40 gallons of water containing 3 mg/L
chloramine.