I had a Blow Over through standard airlock. Just blew the cap off, oozed out all over towel wrapped around carboy. I quickly sterilized a blow off tube, removed airlock, very carefully wiped around opening and put in tube, instant bubbling. Foam subsided somewhat overnight but still great bubbling. I switched back to sterilized airlock and immediate activity less than a sec apart. Any bacteria or contamination concerns switching back and forth?