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Message: [QUOTE="koiguy1969, post: 178568, member: 1264"] wow... some editing is neccessary on my last post.... that should read 9 watts, not "( watts." and "you should plumb a U.V [I]after[/I] a pressure filter." my keyboard batteries must be getting low. and my filtration is external...i just run a prefilter, before my pump to trap solids before clogging my pump or getting pureed into poop soup and sent to biofilter... but my filter is a DIY upflow waterfall box (SKIPPY STYLE) and the water returns to pond, via a weir,or spillway (gravity flow) ..not tubing under pressure. a U.V would restrict flow and cause filter overflow!! and [B]YES[/B], my U.V still works... i only run it about [B]10 days a year.[/B] So in 6 years its got 60 days or 2 months use!!! bulbs are rated in hours. mine is rated about 9000 hours. or 8 months.of use then they start loosing effectivenmess. A U.V only needs to be ran 24/7/365 if your using it for sterilization, "parasite and pathogen control"... on a unplanted formal koi pond yes..on a garden pond with koi as a [B]clarifier,[/B] or "just green water alge control"....not neccessarily, once the single cell alge is dead,& green water gone, no need to run it. my water remains clear all season. [/QUOTE]