The kill rate of a UV filter is a relationship to the wattage and the flow. The bigger the wattage the lower the flow the higher the kill rate.
I also believe that it kills the good with the bad. I use to use my UV for about a day once or twice a month.
As I am now on ZEOvit UV is not used (why spend all that cash to build a bacteria base and then kill it with UV).
Tom R
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