On an industrial level, the use of UV on purified water systems is being phased out.
Microbial counts after the UV sterilizer are lower but further downstream microbial count goes right back up to pre "UV" levels. It appears the "bugs" regenerate just as quickly as the UV can destroy them. The company I'm at now who is one of the big boys in "Big Pharma" has determined UV sterilization is a waste of money and is globally phasing them out.
I won't be buying one for my aquarium any time soon.
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getting a qualty UV is first. having the right flow is as important, higher flow for bacteria and low flow for parasite, aqua uv is the only compny out there that can actually answer questions about their product and make proper reccomendations and size, type and flow
I got one because Ive always been told they battle nuisance algae, and I have seen a great decrease in since I've installed it about two weeks ago.
I dont have any complaints about it so far, but then again I'm obviously a newb. :bablefish