I keg my cider at 18psi for about two weeks and it's nice and carbed up. My question is, will I always lose the first pint or so to pure foam? Basically, I turn my CO2 down to 5psi for service. My line is 15 feet (3/16") and I serve between 35-40 degrees. And every time, the first glass and a half is straight foam. Then it flows nicely. Any input appreciated.