Purity - Activated Carbon/Caffeine Removal/Purity

[Incarnate]

Swim has used the cold water extraction technique several times with varying degrees of success, he currently strains the 80mls of solution of
40 8 mg tablets through a natural brown coffee filter, then when filtered, runs this through a basket of activated carbon grains, to remove caffeine (before drinking end product) Does activated carbon really reduce caffeine content in the final product? Does filtering the solution through the carbon cause a reduction in codeine content/quality?

any advice would be graciously appreciated.

[pixplzthx]

This has come up a time or two, I believe in various forums around the net. It does appear that the GAC does "catch" some of the codeine. If your main goal is caffeine reduction than adding a few more pills isn't all that big of a deal.

No one seems to have any hard numbers on how much codeine is captured by the GAC.