There was no manual when I purchased this item, is
According to Pondmaster, location doesn't matter as much as the flow going through it. You will have to plumb it where it is convenient for you, and allow for bypass valves. From their website:
How much water should I flow over my UV?
Just enough and not too much. Easy, right? On the contrary, this is a very tough question. To clarify, or control green water, the recommended dosage is 15 microwatts per second per cubic centimeter of water at a frequency of UVC of 265 nanometers. Whew! What this boils down to is a formula for the right amount of sunburn. You don't want to incinerate the cells, that would take too much energy, you don't even need to kill them, just to stop them from reproducing, so there is a maximum recommended flow rate that ensures that the cells passing through the light will get enough of a 'tan' to make them sterile (hence the term UV Sterilizer). Too fast a flow means not enough exposure and hence, no effect on the cells. Our UV's are rated, therefore, by the maximum flow that will still provide for enough exposure to the light to be effective. It follows that you can make a light more effective by slowing the flow, thus increasing exposure time, so we often recommend a Valved Bypass [insert link to Valved Bypass instructions] to selectively flow only part of the water going to the falls through the UV, to maximize exposure rates. However, and this is the tricky part, if the flow is too slow and not enough pondwater is being exposed quickly enough, the algae can reproduce before they make it into the UV. This sometimes happens in larger ponds with lots of nutrients and sunlight, and generally requires multiple UV units for effective control. The point is, do not exceed the maximum flow rates recommended or your UV just won't work, and decreasing the flow will typically make the UV work better.
on Aug 31, 2011