Bloom by Nucleus Coffee Tools [New]Introducing the Bloom from Nucleus Coffee Tools. Bloom is a next generation brew bed preparation tool, created to address one of the most overlooked but critical stages in brewing: preparing the coffee bed before the first drop of water hits. Using its retractable mechanism and dual needle configurations, Bloom breaks up clumps, redistributes density, removes hidden air pockets, and lifts chaff to the surface. Its specially coated needles are