How do I prevent sanitizer from getting sucked back into my Chronical during cold crashing?

There are a few ways to prevent sanitizer from getting drawn back through the blow off tube from liquid contraction during crash cooling.

Users with a pressurized transfer setup and a high-resolution gauge can apply a small amount of pressure to the vessel.  We recommend applying just 0.5 PSI to fill the head space with CO2.  This method maintains a fully closed system and prevents oxygen contamination.

Another great way for owners of Chronicals or Brew Buckets to keep a closed system is to remove the blow off assembly, sanitize a standard party balloon, then fill it with CO2.  Then attach the balloon to your blow off barb/cane.  The small amount of pressure from the balloon forces CO2 back into the fermenter.

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