i have not gotten that far as to compare what media all the "big" guys are using yet.... lol
I do believe it must be something to do with O2, but i have heard that gill flukes are common in p14, maybe it helps them battle them easier?
Ken, thanks for chiming in, you are not DE-railing at all!
Your UV dosage is at 150mJ/cm^2......3x the standard required for normal tanks. This may have helped in both oxidation and parasite control. If you got bad water out of the tap this will help as well.