How do you layer carboy with co2?

[Nerdie]

I have a kegging system, with tank and regulator...

I make mead and since it is oxygen sensitive... charlie papazian suggest putting a layer of co2 before the siphon... I have been using my portable handheld co2 that uses like paintball metal tanks (really small). But it can get pretty expensive... anyways.. how do I use my kegging system? It has a regulator and then it just connects to a tap.... since I am not using a tap... how to a put a layer of co2 with my big co2 tank instead?

 

[TipsyDragon]

easy unscrew the quick disconnect. point the end of the tube into your carboy and turn the CO2 on as low as you can.

also if you can get a hold of a block of dry ice that will work too. just break off a small chunk and drop it in a cup of warm water then pour the fog and only the fog into the carboy as you fill it. then do the same AS you are capping it