Originally Posted by Nightshade
Should be a non-issue
Agree also...I've had up to 3 actively fermenting brews into the same blow off at the same time.
Just be sure to have your blow off at the same or lower level than the carboy; also, if you cold crash you would be best served to change the blow off fluid just in case... Those instances are about the only time you'd ever have to worry about fluid being sucked back up. The yeast themselves can't make their way up the blow off tube...
Packaged: Fruitcake Old Ale
Primary: 15 Min Pale Ale (Waimea hops), Unoriginal clone (hoppy session mead)
Secondary: Why do I keep this line here...?
Bulk Aging: Simple Cyser '15, Cocobochet, Wild Cider (2014 & 2015)
Planned: So many ideas, not enough time to brew them....