Quote Originally Posted by captexas
I would think it best to have the UV on a separate loop that either dumps back into the tank or into the return area of a sump instead of dumping into the refugium and having the refugium fed by water straight from the tank. But then some would argue that the UV is not really filtering 100% of the water in the system. Of course if your system is filtering the total water volume a few times an hour as it should, then all water will eventually pass through the UV.
agreed.