Jump to content
Sign in to follow this  
the_partisan

Does a flat bed/slurry matter for conical brewers?

Recommended Posts

Posted (edited)

You can find lots of information online that if you're using V60 or similar brewers that you must have a flat bed at the end of the brew or your extraction will be "uneven". It also seems like a recent thing as the original designers of the device in Japan didn't seem to care about having a a flat bed. Is there any actual testing on this (i.e. by taking dry residue from different parts of the brew bed) or is it just one of those things that people take for granted without giving it a thought? Who is not to say that in drip the extraction doesn't happen during drawndown but when hot water makes contact with the slurry (i.e through washing)?

 

I did a few brews on a V60 like brewer (Origami) without doing a final swirl/tap but just letting drain and it didn't seem to lower EY when doing bloom + two pulse pours. The one without the swirl salso eemed cleaner likely because you're not kicking more silt into the brew?

Edited by the_partisan

Share this post


Link to post
Share on other sites

I'm undecided on this. I have had very tasty brews with uneven/pitted beds. With permanent filters like Kone & Hario Cafeor, these seem to be the tastiest.

 

Until the liquid drains, I see the slurry as just that, a floating/swirling mixture of particles semi-suspended in the liquid, if you pulse pour at a low water level you can see the whole lot churning as you add water towards the end of the brew.

 

I think it is important to get the whole bed wet at bloom, especially if using a few pulses (lots of little pulses with a coarse grind seem to do OK without a specific bloom), so that particles aren't left dry & excluded from contributing to the brew.

 

I think there can also be a trade off when brewing fine, or with larger brews, where silt passing through the paper causes bitterness even at normal extraction levels. Here, it can be advantageous to disturb the bed as little as possible to minimise silt in the cup/server.


“Coffee evokes the most insane reactions in people”, Rene Redzepi.

 

https://markwjburness.wordpress.com/

Share this post


Link to post
Share on other sites

Yes agree that obviously if grounds don't get wet at all then it's a issue. However I don't think it matters that some ground got wet 10 seconds after another? I think the bulk of the extraction happens very quickly. I did a test brew with 13.5g coffee, 40g bloom and just pour 110g water (I use a 2mm flow restrictor) as a very gentle stream right in the middle. After diluting it still ended up at 18% EY and was very tasty too. The brew time was something like 1:45 perhaps. Then poured another 75g of water on to the slurry and let that drain too in another cup. This part had lower TDS (0.7% or so) and quite different flavour profile. Perhaps the latter stages of brew do contribute little flavour, but it's not major and act mostly for dilution?

 

Also pouring in spirals seems only worth while for bloom and not for latter stages.

Share this post


Link to post
Share on other sites
Posted (edited)

Some of the stuff I'm referring to:

 

 

* Pouring water over different parts of the bed evenly to even the temperature

* Stir with a spoon and tap to level the bed

* If top of the slurry is too muddy your grind is too fine - I don't think this is valid, depending on how you agigate the brew the fines can end up at the top or the bottom rather easily

 

Basically if you bloom and pour the rest gently in the middle you're likely to get as a good a brew as following all these steps?

 

and another one:

Edited by the_partisan

Share this post


Link to post
Share on other sites

Also pouring in spirals seems only worth while for bloom and not for latter stages.

 

For finer grinds &/or bigger brews, sure. I used to make large (~650g) Melitta brews & just pouring down the middle after pre-wet worked well, but it can slow down the pour. Now, I make 3x 1 mug brews consecutively & it's a little easier to keep to consistent pour timings with spiral pours & maybe grind just a tad coarser.

 

Sure, for a single brew, just pouring down the middle can work well.


“Coffee evokes the most insane reactions in people”, Rene Redzepi.

 

https://markwjburness.wordpress.com/

Share this post


Link to post
Share on other sites

I like using the Bonavita immersion brewer for drip. With the valve shut you can pour a generous bloom (say 50g water to 13.5g coffee) and give it plenty of time to soak making sure everything is saturated before opening the valve for the rest of the pours.

 

With other brewers a generous bloom can seem to run through very quickly and can force larger particles through the filter.

 

As the majority of TDS is picked up in the bloom and first pour these stages seem most critical?

 

If you pour with minimal agitation you tend to get flat beds without trying. The bed settles and you get almost clear water above. A final pour with more agitation doesn't seem to overly disturb the bed (unless aggressively hosing)

 

The Behmor Brazen can leave indentations where the shower head sprays but doesn't seem to cause any problems.

Share this post


Link to post
Share on other sites

Scott Rao sells a spray head too

 

https://www.scottrao.com/products/ufo-upgraded-spray-head

 

However, the spray head greatly favors the grounds near the center of the coffee bed (evidenced by the large, depressed area in the center of the spent coffee bed). The result is exceptionally uneven extraction, which yields more bitterness and astringency and less overall extraction levels.

 

Our goal was to help the machine reach its full potential by improving the evenness of its extractions. Our device produces better and higher extractions by distributing water more evenly across the entire coffee bed.

 

I have a hard time thinking the manufacturers/designers of this device couldn't figure this out?

Share this post


Link to post
Share on other sites
I have a hard time thinking the manufacturers/designers of this device couldn't figure this out?

 

To be fair though, all spray heads bar mayyyyybe the Fetco stupid magnetic thing (which is actually pants) feel like they are afterthoughts to the entire machine.


'it's all about the microbubbubbles'

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • About:

    Coffee Forums UK is the UK's premier coffee forum Started in June 2008 by Glenn Watson, we now have more than 22000 mainly UK based members, and welcome more than 3000 members and visitors from around the world each day! With strategic investment and digital expertise from the Jackson Lockhart team (Tait Pollack and Adam Bateman), we are taking Coffee Forums UK to the next level, and are delighted to share the journey with you.

    New Members:

    We are often referred to as the friendliest forum on the web and we look forward to welcoming you onboard.

    Terms of Use

    Advertising

    Coffee Forums Media Kit

    Buy Advertising Space

    Donate

    Get Your Supporter Badge (per year)

×
×
  • Create New...