Never said it was a cure all, i said we have used it, and it has worked. And we have advised it to a few customers who have had the same successful results.
You can't argue with results you have seen yourself.
Its like UV is meant to be the end of all parasites in a fish system as most people will tell you, but this is rubbish, i have seen systems with UV fitted still come down with ICH problems, the most recent example i have seen is of a LFS near Gloucester that uses a centralised system having to take ALL their fish off sale because they had a case of ICH and their multiple banks of UV steralizers did nothing to help rid the parasite.
You can only go on what you have seen.
Ben