Actually Spectrapure has been around for ages and they have been experts on the topic of water filtration before all the other RO shops came online. Charles (the president of the company) has been very helpful with any questions I've ever asked him. I will take his word as the truth. He has never done wrong by me
(he even gave me some really good pointers on how to increase the output on RO units........... which I hope to write an article on some day)
True the 2 carbon blocks you propose will break the chlorine from the chloramaine but I am not sure if the second carbon block will catch all of the ammonia. Then again most people only have the one carbon pre filter and it is recommend by spectrapure to put another post carbon for the ammonia on their machines (which only have 1 pre carbojn). Who knows............. maybe just 2 ways of doing the same thing
I think you can find many threads in reefs.org & reefcentral.
Cheers,
Vic [veng68]