Activated Carbon

[nsu7]

I was reading in the freshwater forum and they said that the activated carbon is only "activated" for 72 hours to a week and not to change it. I seem to be learning that in saltwater tanks, carbon in large amounts serves as a biological bed more than a chemical filtration tool. Does the activated carbon act the same way in saltwater tanks, ref the short term activation?

 

[lando]

GAC is more chemical then biological filtration. It needs to be changed on a regualr basis or it can start leeching what it has taken out of the tank right back into it.

 

[nsu7]

Wow, so carbon tubes with 15 lbs of carbon lasting for 5 years as a bio bacteria bed according to some people is probably a bad idea?