http://www.thekrib.com/Plants/CO2/tubing.html

found the article!

"E. Mito" wrote in message
...
In article , "Steve Galupe"
writes:


Hello... I have read somewhere (The Krib?) that silicone tubing can leak
out
30% of the CO2 gas bec. of the permeability of the airline. CO2 tubing
is
made from different materials that keep this from happening.


I noticed CO2 tubing for sale at Drs. F&S and it was significantly more
expensive than regular airline tubing -- I'm using regular airline tubing
and
get satisfactory CO2 levels in my water...does the CO2 actually damage the
tubing and degrade it? Anybody know?



Erica
http://members.aol.com/_ht_a/mitoem/mitoem/index.htm