Ok, after a few days of research into activated carbon, i found three great links that explain everything one would need to know when selecting activated carbon for water filtration.
1. Wiki, scroll down to properties section:
2. Particle size chart:
3.Standard Mesh sizing(to keep powdered carbons/small granules from escaping your mesh. Look at the chart in the lower right)
Example of technical data AC from buyactivatedcharcoal.com:
Note the iodine number, apparent density, hardness number, ash content, and the 8x16 size of the carbon-meaning greater than 8 less than 16 on the particle size chart above.
This is all the knowledge you need to buy AC. With that in mind i am deciding between these two right now:
I may order smaller sizes of both, and see which is better. However, the ability of activated carbon to do its job depends of course on the quality of the carbon, but also on the time of exposure. Will there be enough carbon in that little fuel filter to have an effect? Will the water be in contact long enough to be cleaned? I will get back with test results next week after all my stuff for this comes in. Because this stuff is really high quality, i will at least be able to rule out the AC as being defective. If it works we will have a replinishable, cheap way to utilize carbon filtration in our gravity setups without having to buy katadyn carbon filters or frontier pros.