The water in my office is rich in iron, iron bacteria and manganese. I put in a reverse osmosis filter to purify the water and this UV sterilizer to kill any bacteria or virus. The device comes with a spare bulb and will sterilize more water than my filter. The included clips allowed me to mount it over existing filters and it works great. It's low power, although I've found the water in the filter gets a little warm when not in use, but I don't see that as a problem.
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