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UV bulbs in Canisters

This is a discussion on UV bulbs in Canisters within the Freshwater Aquarium Equipment forums, part of the Beginner Freshwater Aquarium category; --> Originally Posted by jaysee The UV bulb is built into the head (top) of the filter. The incoming water flows over the bulb on ...

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UV bulbs in Canisters
Old 04-05-2013, 11:09 AM   #11
JDM's Avatar
Originally Posted by jaysee View Post
The UV bulb is built into the head (top) of the filter. The incoming water flows over the bulb on its way to the bottom of the filter body, where it is then pulled up through the layers of media. It is not in contact with any other media.
Most things have been mentioned already, contact time, water flow rate, one more thing to need to replace when it fails is another point. I'll just do my usual rambling.

If these are in the flow before the media (which I believe is the case as Jaysee pointed out) then this compounds the issues with these setups as the water is not already clear. The UV relies on direct light exposure and particles (turbidity) will shade the water that is not directly against the bulb or lens. Any UV system puts the light exposure as the very last point before use. I expect that tannic water will almost nullify most UV treatment altogether even before turbidity comes into play, but that is just a logical assumption.

I had a few paragraphs more but I deleted them, too much information. If anyone really wants it, pm me.

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