03-05-2008, 12:56 PM
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I know that there are a couple of products on the market that Hang on the back(or side) of a tank and act as a circulating pump. I have no experience with these.
I have mine inline(on the tanks) with canisters and 3500gph circulation pumps on the replenishment systems' reservoirs. I use them on the discharge side of both the filters and the pumps. Just the way I was told to do it years ago and I've never doubted the effectiveness of such a configuration. No need to, it works.
I have a chart around here, somewhere, that gives one a guide of what size UV light to use. It is based on water flow of the pump. I hope to find it but, right now it is "Mission Impossible". The fishroom is in a mild state of disarray. At least, more so than normal. It was published in TFH magazine some years back.
I believe that I am using 14w bulbs on the 3500gph pumps, maybe larger. They are not in a good position to readily check. I change them once every three months just to make sure I get maximum performance. I will be doing routine maintainance on all recirulation systems in a couple of weeks and will check then. I believe the lights on the Magnums are either 4w or 7w. I will check that this weekend when I do the maintenance on the canisters. A dreaded, albeit necessary, task.