We buy COD test kits from Austin American Technology
for $13.

http://www.aat-corp.com/

-Joe


-----Original Message-----
From: d. terstegge [mailto:[log in to unmask]]
Sent: Thursday, March 04, 2004 4:01 AM
To: [log in to unmask]
Subject: [TN] COD test kit


Hi Technet,

To check the carbon filters of our AAT closed loop cleaning system we
test the water coming out of the filter with a so called "COD testkit",
COD=Chemical Oxigen Demand. The kit consists basically of a simple
plastic ampul with a few milligrams of some chemical powder. The idea is
to make a little hole in the ampul, fill it with water, wait a few
minutes so the dissolved chemical reacts with organics in the water, and
then check the color of the water. Pink=OK, Blue=filter is saturated and
needs replacement.
The test should be done a few times a week.

I just found out that we're paying a ridiculous 27 euro's for one such
ampul (about 36 US$).  Does anyone know a more affordable way to check
if a carbon filter is still clean enough to catch organic contaminants
from the rinsing water ?  Maybe you know which chemical this is ?

Best regards,

Daan Terstegge
Thales Communications
Unclassified mail
Personal Website: http://www.smtinfo.net

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