I had run a UV for over 4 years, and each time I pulkled it apart it was relativly clean. Very little build up of any sorts, so I would think that w/o should be fine, I also have to say that I would never run a system without a UV even with all of the debate, I ffound it kept the water chrystal clear and I had few problems with any problem alagaes sickness etc.
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280 display 72x36x26- 90 gal sump. Aqua medic t5000 skimmer, Aqua Medic 3x250 w 10k and 14 k and t5's. Tunze wave box, UV and phosban reactors in sump. Tank is just started as of Feb 01 08.
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