Brew Bed Preparation in Spotlight: Bloom Wins a Good Design Award

Bloom, a brew bed preparation tool from Nucleus Coffee Tools, received a 2026 Australian Good Design Award in the Product Design – Housewares and Objects category. Brew bed preparation is the step between dosing and the first pour: breaking up clumps, releasing trapped air, and shaping the coffee bed so that water percolates through it evenly.

Nucleus Bloom won a 2026 Good Design Award, Australia’s national design program, in the Product Design – Housewares and Objects category, as listed in the Good Design Australia winners’ index [1] and announced by Nucleus Coffee Tools on 9 October 2026. 

The award matters to brewers less as a trophy than as recognition of a step most recipes skip. Pour-over recipes specify dose, brew ratio, grind size, and water temperature, yet rarely specify the condition of the dry coffee bed before the first pour.

What is brew bed preparation?

Brew bed preparation is the conditioning of dry ground coffee inside the brewer after dosing and before the first pour. It aims to remove clumps, release trapped air, and leave a bed of even density, so that water meets every particle at a similar rate during percolation.

Preparation starts once the dose, the weighed mass of dry ground coffee, is in the filter; at Slow Pour Supply, our house recipe below uses 16 g. That settled dose is the coffee bed. Pour-over is a percolation method, meaning water passes through the bed and drains out the bottom, whereas in immersion brewing the grounds steep in a set volume of water. Every grinder also produces fines, particles far smaller than the average grind size that pack into the gaps between larger grounds and slow drainage when there are too many of them.

According to the Good Design Australia entry for Bloom, clumping, static charge, and trapped air in ground coffee cause water to move unevenly through the bed, and preparation is often treated as an informal step. Most pour-over recipes leave this step undefined, which makes it a variable that changes from brew to brew.

Why does an uneven coffee bed cause channeling?

An uneven coffee bed causes channeling because water follows the path of least resistance. Water travels faster through less dense regions of the bed, so a clump next to a loose pocket diverts flow: some coffee over-extracts in the channel while the coffee around it under-extracts.

Channeling is a localized, uneven flow of brew water through the coffee bed. Barista Hustle identifies uneven distribution as a primary cause and notes that channeling makes coffee taste weaker, more bitter, and less balanced [7]. Barista Hustle’s guidance is written for espresso; the same flow principle applies to the lower-pressure percolation of pour-over, where Jonathan Gagné’s research links fines and uneven particle packing to channeling [10].

Extraction yield is the percentage of the dry dose that dissolves into the brew. Total dissolved solids (TDS) is the concentration of those dissolved coffee solids in the finished cup. The classic Coffee Brewing Control Chart, developed by E. E. Lockhart in 1957 and taught by the Specialty Coffee Association (SCA) as the Golden Cup Standard, places ideal filter coffee at 1.15–1.35% TDS and 18–22% extraction yield [5][6]. A 2023 update from the UC Davis Coffee Center, supported by the SCA’s Coffee Science Foundation, keeps that zone as a reference point but maps flavor attributes across the whole chart and shows that consumers split into two groups who prefer different combinations of strength and extraction [11][12]. Channeling widens the spread of extraction within a single bed, so a cup can hit a target average while containing both under- and over-extracted flavors.

Trapped gas adds a second source of unevenness. Roasting produces carbon dioxide (CO2), part of which stays inside the porous structure of the bean and releases abruptly during grinding and extraction, affecting the extraction process [8][9]. The bloom is the first small pour that wets the whole bed and lets this gas escape before the main pours begin.

How does the Bloom Distribution Tool prepare a coffee bed?

The Bloom Distribution Tool prepares a coffee bed with retractable needles in two configurations and a shaping tip. Straight needles reach deep into the bed to break clumps and release trapped air; fan needles flare outward to work the surface and lift chaff; the FlowTip presses a central divot before the first pour [1][3][4].

The tool applies the Weiss Distribution Technique (WDT), stirring ground coffee with fine needles to break up clumps, to filter brewing. Daily Coffee News describes it as a WDT tool built for pour-over and drip coffee beds [3].

How to prepare a pour-over coffee bed using the Bloom Distribution Tool, step-by-step

To prepare a pour-over coffee bed with the Bloom Distribution Tool, dose into a rinsed filter, stir the dry grounds to the bottom of the bed with the straight or fan needles, level the surface, and press a shallow central divot with the FlowTip. Then bloom with 40 g of water for 40 seconds so the whole bed wets evenly before the timed main pours.

The parameters below are the Slow Pour Supply house starting recipe, developed in our own brewing, not an industry standard. Adjust grind size first, then brew ratio*.

*Brew ratio is the mass of dry coffee to the mass of brew water. Contact time is the total time water and coffee are in contact, from first pour to end of drawdown.

1.        Rinse the paper filter with hot water to preheat the brewer, then discard the rinse water.

2.        Dose 16 g of freshly ground coffee into the filter.

3.        Twist the Bloom Distribution Tool to extend the needles: straight needles for a conical brewer, fan needles for a flat-bottom brewer [3][4]. Insert them to the bottom of the bed and stir in small circles while lifting slowly, so the whole depth is worked [4].

4.        Level the surface with a light shake of the brewer; avoid tapping hard, which compacts the bed.

5.        Retract the needles, turn the tool over, and press the FlowTip into the center of the bed to make a shallow divot that gives the bloom pour a consistent starting point [1][3].

6.        Pour 40 g of water for the bloom, wetting all the grounds, and wait until 0:40.

7.        At 0:40, pour in circles to 130 g at a flow rate of 7–8 g per second, then wait until 1:30.

8.        At 1:30, pour to 210 g at a flow rate of 5–6 g per second, then let the bed drain without pouring until 2:10.

9.        At 2:10, pour in circles to 230 g at a flow rate of 4–5 g per second to flood the bed, then pour the final 30 g in the center to finish at 260 g.

10.    Let the bed drain fully and note the drawdown time.

How do you check for an even coffee bed?

Check the bed twice: once before the first pour and once after the drawdown. A level bed going in and a flat bed coming out means water moved through the coffee evenly. These checks come from our own brewing practice at Slow Pour Supply.

At the beginning of the pour

•          After the dry stir: the surface is level from wall to wall, with no mounds, ridges, or visible clumps. If one side sits higher, give the brewer a light horizontal shake rather than a tap.

•          After the FlowTip: the divot sits in the exact center of the bed. An off-center divot draws the bloom water to one side.

•          During the bloom: the whole bed darkens within the first few seconds, and the crust rises evenly. Dry, pale patches or a dome that rises on one side only mean the bloom pour missed part of the bed; reach the outer edge on the next brew.

At the end of the pour

•          During the drawdown: the water level falls evenly across the bed rather than draining faster on one side.

•          After the drawdown: the spent bed is flat, with a fine, even layer on top. A flat bed indicates water passed through the coffee evenly.

•          Grounds stranded high on the walls: coffee left above the water line extracted less than the rest of the bed. Keep each circular pour inside the bed, and use the final center pour to settle the grounds.

•          Craters, holes, or a sloped bed: these mark where water channeled or the pour stream hit one spot. Lower the kettle spout, slow the flow rate, and keep the stream moving.

References

1.        Good Design Australia, “Bloom”, 2026 Good Design Award, Product – Housewares and Objects. good-design.org

2.        Nucleus Coffee Tools, “Bloom wins 2026 Good Design Award”, Nucleus Hub news, 9 October 2026.

3.        Daily Coffee News, “Nucleus Coffee Tools Unfurls the Bloom Distribution Tool for Drip Coffee”, 8 October 2025. dailycoffeenews.com

4.        Nucleus Coffee Tools, “Bloom User Instruction Manual, Version 1.0” (PDF), 2025. nucleuscoffeetools.com

5.        Specialty Coffee Association, “Coffee Standards”, section 5.1 Golden Cup Standard (PDF; based on Lockhart, 1957). sca.coffee

6.        Barista Hustle, extraction yield and the 18–22% SCA recommendation. baristahustle.com

7.        Barista Hustle, “Channelling: Understanding How to Identify Critical Unevenness in the Flow of Espresso”. baristahustle.com

8.        Smrke, S., Wellinger, M., Suzuki, T., Balsiger, F., et al., “Time-Resolved Gravimetric Method To Assess Degassing of Roasted Coffee”, Journal of Agricultural and Food Chemistry, 2017. ZHAW repository (PDF)

9.        Royal Coffee (reprinted from Daily Coffee News, 10 October 2018), “More from ASIC Portland on the Cutting Edge of Coffee Science”. royalcoffee.com

10.    Rao, S., “The happy medium amount of fines”, citing Jonathan Gagné, The Physics of Filter Coffee. scottrao.com

11.    Guinard, J.-X., Frost, S., Batali, M., Cotter, A., Lim, L. X., & Ristenpart, W. D., “A new Coffee Brewing Control Chart relating sensory properties and consumer liking to brew strength, extraction yield, and brew ratio”, Journal of Food Science, 88(5), 2168–2177, 2023. doi:10.1111/1750-3841.16531

12.    Pooler, F., “Why the New Coffee Brewing Control Chart is a Big Deal”, Fresh Cup, 18 December 2024. freshcup.com