This is not a BIAB question per se but I decided to post here.
Headspace with oxygen is the enemy for longer secondary and tertiary fermentation -- beer, wine, mead, etc. I want to introduce a blanket of CO2 into the carboy to occupy the headspace and provide an oxygen barrier usng a CO2 tank. Picture the larger neck hole in the carboy and a siphon hose connected to the CO2 tank. Open the valve and CO2 goes in and in theory the oxygen is pushed out of the empty space in the neck. When the headspace has been purged, install a bung with airlock. Since the CO2 is heavier than the oxygen it should provide a blanket of protection.
So now the question -- what pressure and how long should a purge cycle be for a carboy with reasonable headspace -- 30 seconds, minute,??
Opinions and recommendations are solicited.
Headspace with oxygen is the enemy for longer secondary and tertiary fermentation -- beer, wine, mead, etc. I want to introduce a blanket of CO2 into the carboy to occupy the headspace and provide an oxygen barrier usng a CO2 tank. Picture the larger neck hole in the carboy and a siphon hose connected to the CO2 tank. Open the valve and CO2 goes in and in theory the oxygen is pushed out of the empty space in the neck. When the headspace has been purged, install a bung with airlock. Since the CO2 is heavier than the oxygen it should provide a blanket of protection.
So now the question -- what pressure and how long should a purge cycle be for a carboy with reasonable headspace -- 30 seconds, minute,??
Opinions and recommendations are solicited.