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Fluidised Beds

Fluidised Beds

This microscope image shows the interior cell walls of a coffee bean. Image by Wenn, Royal Photographic Society. In our latest poll on the BH Facebook Group, you asked us to check this out: ‘If flow goes in much faster than it comes out, then you have the...
Steel, Glass, Ceramic?

Steel, Glass, Ceramic?

What’s the most temperature-stable material to use when brewing? The short answer is: plastic cones are best. They absorb heat from the brew water less quickly, absorb less heat overall, and lose that heat to the air more slowly.  This conclusion may seem...
What’s the Best Sprayhead Design?

What’s the Best Sprayhead Design?

Photo: A UFO Sprayhead   Is it better to have as many holes as possible in your spray head; hardly any to make more agitation; or somewhere in between?   To achieve even extraction in batch brewing, it’s important to get all the grounds evenly wetted —...
DIY Water Recipes Redux

DIY Water Recipes Redux

A couple of years ago, we published a method for making your own water recipes, using concentrated mineral solutions, diluted with deionised water, to make a range of waters with different hardness and alkalinity. This post updates this, with new recipes that allow...
If not Channelling, Then What?

If not Channelling, Then What?

“Professor Abbott told us he doesn’t really believe channelling occurs in espresso (except in drastic cases). So if not channelling, then what?” Only a few weeks ago we were telling you that over-extraction isn’t really a thing, and that it’s all caused by...

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