That maybe some of the dumbest advice I have ever heard. The brewery ships the keg pressurized at the exact amount of co2 level the brew master intended. You need to maintain that level of co2 throughout the lifecycle of the keg. To do that, you need co2 pressure set at the right PSI. If you "bleed" the keg for 1/2 the keg, it will be flat in no time.
The only thing I do sometimes with new kegs is to let them sit untapped for a few hours just to settle and to make sure they are at the appropriate temp. You never know how they were shipped (shaken up, loss of temp, etc.)
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