both are proven to work for many years now....its not really debatable:P
gfo and rowaphos are probably in 75% of all tanks and used for many years from experienced to beginner.
to say one doesnt work is to say that the many reefers who use it dont know what they are talking about?
seems unlikely....
there is a diff between the both , rowaphos is steamed while gfo is dried granular, both are very effective and used throughout the hobby in many different situtions to remove phosphates.
ive never known either to leach back phosphates
i would stay away from aluminum based phosphate media.
to each their own?
cheers
denny
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