What Is Pre-Infusion Espresso?
Pre-infusion is a key parameter that allows one to grind finer for espresso because it helps reduce channeling For those who don’t know, pre-infusion is letting water into the coffee puck at a lower pressure than normal. Typically, pre-infusion pressure is between 0.5 and 4 bars. 1 to 2 bars is typical. Is pre-infusion necessary … Read more