I am currently not running a recirculating, and can't wait to get my Avast CS1 in next week....my current SWC freaks out with any change in water depth.. When I turn it off to do a water change then back n take a day or 2 to get back into regular mode...it's really aggravating, which is part if what's making me buy a whole new skimmer...
And my sump only fluctuates enough for my ato to kick on and off which is less than an inch and it freaks the skimmer out....not really anything can be done about that...