Take the 2-minute tour ×  I've read that filtering requires two
kegs. I've only got one corny keg but I'd like to filter my brew
with a canister or plate filter. Do I risk overly oxidizing the
beer if I were to filter from a keg into a carboy, then siphon
the carboy back into the keg for force carbonation and serving?
Thanks, Matt  share|improve this question add comment  1 Answer
up vote 2 down vote accepted  You won't necessarily pick up more
oxygen, if you purge both the keg, carboy and filter with CO2.
Purging will minimize the exposure to oxygen.  But you'd need 3
transfers:    1. rack from the carboy to the keg (only the keg
will handle pressure.)   2. from the keg, through the filter, to
the carboy.   3. finally, rack from the carboy to the keg again.
With this many rackings, I'd be more concerned with
contamination than any ingress of oxygen.  If you can ferment in
the keg, then you could in principle save one racking and filter
directly from the keg to the carboy, and then transfer back to
the keg