So, I wanted to bring this discussion back to light as I am contemplating some things during my more extensive research into ich sterilization with UV.
It started when I ran across an article on the Emperor Aquatics brand of UV sterilizers, basically the main competing company of UV sterilizers to the product I own, the AquaUV sterilizer. Both are highly regarded for their performance and customer support and are considered the better UV sterilizers in the industry. What struck me as odd is the higher recommended exposures recommended for killing marine protists by Emperor Aquatics. Here's what the two companies suggested for exposure levels to kill marine protists:
MODEL Exposure GPH
57-watt AquaUV 90,000 uW/cm2 1066
50-watt Emperor Aquatics 180,000 uW/cm2 ~300
That's 2x the recommended level of AquaUV! So that made me do some more research and found that the marine ich kill exposure of 336,000 uW/cm2 is mainly an extrapolated number from freshwater ich kill exposure of 100,000 uW/cm2. Awesome! Soft science! Well, that's the best I have so I'll run with it, which basically means I need to only run ~300 gph through the UV sterilizer, instead of the 1066 gph recommended by the manufacturer.
Great reference on ich:
http://edis.ifas.ufl.edu/fa164
Chart I found for reference... no idea of the source though: