The issue is turnover of the whole tank volume. You can run water slowly through the UV and it will kill everything going through it, but 50gph for a 500g tank is not going to cut it.Just wondering, why would it be bad to put even less gph through the UV Sterilizer than suggested by the manufacturer? Is there a negative to UV sterilizer's working too well? I know the debate out there seems to be that they are un-necessary because they usually don't give a long enough exposure time.
I don't know what the best is for that.
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