I jsut use whatever carbon I can find that is cheapest. just because it costs more somewhere than another place doesn't mean squeezing it hard enough won't turn it into a diamond.
I run simple carbon in filter floss. Nothing fancy. Water is crystal clear and my filter is 10 years old and not ment for the tank size I'm running. It is only an emergency fill in since my biowheel pump burnt out. So if a filter from a 10 gallon tank can take care of a 36 gallon... carbon is good and shouldn't be taken out. That is my story and I'm stickin to it.