I believe anyone reading through this thread would see that I'm simply attempting to find out what source material Aquaforest uses for their brand of activated carbon. I ask because its makes such a BIG difference to whether or not the carbon is useful or useless in a marine aquarium. BRS testing made this more than obvious. If AF cannot answer this simple question then they should just say so. If I, as a consumer, am not allowed to ask AF this question, on your forum, judt say so.