I believe that I read somewhere that ROWA has stripped systems clean, faster enough than phosban and other dry GFOs.
I'll be honest, I can't cite a study, or remember a thread, but all I know from what I've gathered from the vastness of reefcentral, is that more often than not, people have stated that ROWA works faster and better (though I'm not sure about total capacity) than Phosban, bulk, etc.
Maybe it has to do with why it comes wet instead of dry? Who knows.
Maybe check out Jetcat's thread about the GFO removing time periods. I'm sure someone mentions ROWA in there.....