coffee bloom guide 2

https://practicalcoffeecleaninginsight.solsticebrief.com/posts/how-to-build-a-practical-coffee-cleaning-schedule-for-better-brews

The coffee bloom is that quick puff of carbon dioxide when hot water first hits fresh grounds. It happens within the first 30 seconds and signals good freshness. For a pour-over, let it bloom with about twice the coffee weight in water, then wait 30 seconds before pouring the rest. Skipping this step leads to uneven extraction and a flat, sour brew.