What grind of coffee for 30 cup electric coffeemaker?

A medium grind coffee is best for a 30-cup electric coffeemaker. Medium ground coffee has a consistency similar to table salt and is not too fine or too coarse. It is the ideal grind size for a 30-cup electric coffeemaker because it allows the water to pass through the coffee grounds evenly, extracting the flavor and aroma without making the coffee too weak or too strong.