Don't have such a system on my display but I do have my quarantine tank running on continuous water change. I T-ed off my display's return pipe and continously drip into the QT at the rate of about 1 gal/day. The QT has a corner overflow that goes right down the drain. Only thing I am concerned with is salinity creeping up but hasn't been a problem so far. I also have to top up my sump every couple of days, at a gal/day it works out to about 25% per month on my display . Nice thing is after 4 weeks of quarantine, my new fish won't have any shocks going into the display as it's the same water.
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