I ran my doser directly into the feed to my skimmer. No filter on the output.
I used 60ml a day (1ml per gal per day on my 600gal tank). Went with ATM brand to start.
My three zebrasoma started breathing fast (yellow, purple, sailfin) but corals loved it.
Cut back to 30ml, no fast breathing.
Cut back to 20ml for safety.
I'll provide feedback as I see it.
My skimmer's output runs into my macro algae refugium and then to the DT.
I'm also heavy on Kalk dosing (for reference).
<a href="http://s1062.photobucket.com/user/karimwassef/media/0ED2E633-8211-4A5A-A083-F65E694AA6B8_zpsmz6faxa4.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/0ED2E633-8211-4A5A-A083-F65E694AA6B8_zpsmz6faxa4.jpg" border="0" alt=" photo 0ED2E633-8211-4A5A-A083-F65E694AA6B8_zpsmz6faxa4.jpg"/></a>