You simply switch it ON (up position) and it will work for every brew from then on. No need to watch or toggle the switch, just leave it ON. It will saturate the ground coffee in the brew basket and automatically pause, allowing the proper time for the grounds to off-gas. This enables the rest of the brew cycle to extract properly, because expelling the natural gas from the freshly ground coffee allows the water to soak into the coffee better for better extraction. You'll taste less bitterness and a fuller, rounder flavor from the coffee. Allowing the coffee to Bloom is a popular technique for the pour-over method of hand preparing coffee with a kettle.