Suppose I have a keg of carbonated beer and a kegerator. Can I hook the keg up to beer gas (nitrogen, CO2 mix)? Would this affect the beer in any way, or would I have to carbonate with the beer gas to get any advantage to pushing with beer gas? Would I need a stout faucet? Longer lines to balance the system?

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What you propose is the usual way it's done. Carbonate with CO2 (that's why it's called carbonation!), then dispense with beer gas. You do not need a stout faucet. You will probably need to lengthen your dispense lines.

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