Seen a few in this thread were having dramas earlier with the various options of airlock versus blow-off on buckets and chronicals.
Recently had issues with a Sterilock as posted here
http://aussiehomebrewer.com/topic/86659-sterilock-airlock/page-2 so implemented a blow off tube. Worked great until I decided to be an idiot and dump the yeast from the bottom valve on my Chronical. I completely ignored physics and left my blow off installed. Next few days wondered why I was no longer hearing the bubbling of the blow off in the starsan. Figured out yesterday when I looked into the blow off jug to see half the starsan (~100mL) was missing. Once I lifted the hose above the liquid level I heard the blow off tube filled with starsan drop a whack of starsan into the brew and a little bit into the blow off jug :S
What are people doing when taking samples or dumping out the bottom, simply swapping over to a Sterilock or Airlock and returning to a blow off? Problem with that for me and I assume others is that you gotta remove the triclover from the top, exposing the fermenter to the room air potentially.
Thinking a tee piece with a 3-way valve could be handy, one side blow off and one side Sterilock (or other sanitary air filter), or even a CO2 bottle to counter the increased volume when drawing out liquid. Can't think of anything else unless I choose to live with the small risk by opening the top of the Chronical to change it over.