Hi there, I noticed the other day that the pressure barrels in wilkos are on offer so I'm thinking about using it to help carbonate and dispense my beer from rather than bottling with some priming sugar. I'm a bit confused about exactly what to do though. I gather that I'll need to buy the CO2 injector cap (which is conveniently also on offer at the moment) and the CO2 canisters but I've been reading online things about purging the oxygen from the head space and controlling how much pressure to put in. But I can't work out exactly how one purges the O2, nor do I see how to control the amount of CO2 I'm putting in so that dispensing is possible but the pressure doesn't split the barrel. I couldn't see any kind of setting on the valve the control the pressure; maybe I wasn't looking hard enough? Any advice? Ta.