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DIY Aeropress Cold Drip Brewer for Under $30 - How To
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primacoffee
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primacoffee
Joined: 19 May 2010
Posts: 37
Location: Louisville, KY
Expertise: I live coffee

Posted Thu Jul 12, 2012, 9:34am
Subject: DIY Aeropress Cold Drip Brewer for Under $30 - How To
 

We recently discovered this delightful idea on a coffeesnobs.au post and tweaked it to our parameters.  We've been experimenting for a couple of days now and so far have had great results!  

  1. Empty bottle and cut off bottom.
  2. Remove bottle’s cap and puncture with needle. Replace cap. Test flow by filling with water and watching rate, aiming for about 40 drops per minute.
  3. Wet filter and assemble Aeropress, filling with 45 g of medium-fine ground coffee.
  4. Moisten grounds and stir gently, subtracting water used from total water dose. Level coffee bed with finger.
  5. Trim second filter to fit inside of Aeropress and place atop coffee bed, pressing softly to level.
  6. Place Aeropress on jar and mount bottle on top.
  7. Fill bottle with 300 g water and 200 g ice.

Thought you would enjoy it.  We're also experimenting with different filter types (Able Disk-Fine, etc).  Let us know if you've had success with something similar!

primacoffee: aeropress-cold-brew-tower.jpg
(Click for larger image)

 
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Netphilosopher
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Joined: 14 Jan 2011
Posts: 1,602
Location: USA
Expertise: Just starting

Posted Thu Jul 12, 2012, 10:00am
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EvanOz85
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EvanOz85
Joined: 9 Jul 2011
Posts: 268
Location: Lafayette, LA
Expertise: I live coffee

Espresso: La Spaziale Mini Vivaldi II
Grinder: Baratza Vario and Preciso
Vac Pot: Bodum Santos, Yama 5-cup
Drip: Chemex, Kone 3, Kalita Wave,...
Roaster: Hottop B, Behmor 1600
Posted Thu Jul 12, 2012, 10:13am
Subject: Re: DIY Aeropress Cold Drip Brewer for Under $30 - How To
 

Netphilosopher Said:

I find a significant amount of grounds absorption and sometimes some less-than-expected (but still stronger than hot brewed).

Posted July 12, 2012 link

It would be extremely easy to use the plunger to press out most of the absorbed water once it's finished dripping. But would that be a good thing?
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Netphilosopher
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Posted Thu Jul 12, 2012, 11:00am
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yamhill
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Joined: 1 Feb 2009
Posts: 37
Location: Portland, OR
Expertise: I love coffee

Espresso: Silvia PIDed, Nuova...
Grinder: Mazzer Major
Vac Pot: yama
Drip: hario and chemex
Roaster: hot air & drum in the works
Posted Thu Jul 12, 2012, 1:54pm
Subject: Re: DIY Aeropress Cold Drip Brewer for Under $30 - How To
 

Thanks for sharing a new take on cold extraction.

I have a bunch of questions.  I've used Toddy some.  How does the strength and taste of the extraction with this method compare to Toddy?  If I recall correctly the Toddy-recommended ratio of grounds to water is roughly 50g / cup of water for 12 to 24 hours.  At 45g / 2+ cups water (assuming that the ice all melts), the coffee to water ratio, time, temperature are all different.  45g is three double shots in my Silvia.  Is 1/3 of this cold brewer output a good stand-in for a double shot?

Also, I would love to hear more details on the "why" behind some of your guidelines.  For example, here are a few more geeky questions?
Is the ice important to slow the flow of water or temperature or both?
What temperature should the "pre-infusion" water be in the moisten and stir step?
What effects do you get with coarser of finer grinds?
Does the top filter do anything beyond slowing and dispersing the water drops?

John
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oktyone
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Joined: 26 Apr 2012
Posts: 33
Expertise: I love coffee

Posted Thu Jul 12, 2012, 4:23pm
Subject: Re: DIY Aeropress Cold Drip Brewer for Under $30 - How To
 

I've tried this before, works good except you can't control the dripping speed (extraction), sometimes it stops dripping, sometimes it drips too fast, i've used an ABLE disk  (ver.2) and a regular aeropress paper filter on top of the coffee column to help distribute the water evenly.

Inspired by another experiment on a HB forum post i went to a local pet/aquarium store and got some aquarium tubing and dripping spigot and installed it to the plastic bottle cap, works wonderfully and the dripping speed is totally controllable, it tends to go slower as time goes by, but it can be easily adjusted by opening the valve a bit more every once in a while. Still unsure about the taste though, but i love the theatrics aspect of these brewing method.
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primacoffee
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primacoffee
Joined: 19 May 2010
Posts: 37
Location: Louisville, KY
Expertise: I live coffee

Posted Fri Jul 13, 2012, 6:05am
Subject: Re: DIY Aeropress Cold Drip Brewer for Under $30 - How To
 

yamhill Said:

I have a bunch of questions.  I've used Toddy some.  How does the strength and taste of the extraction with this method compare to Toddy?  If I recall correctly the Toddy-recommended ratio of grounds to water is roughly 50g / cup of water for 12 to 24 hours.  At 45g / 2+ cups water (assuming that the ice all melts), the coffee to water ratio, time, temperature are all different.  45g is three double shots in my Silvia.  Is 1/3 of this cold brewer output a good stand-in for a double shot?

Also, I would love to hear more details on the "why" behind some of your guidelines.  For example, here are a few more geeky questions?
Is the ice important to slow the flow of water or temperature or both?
What temperature should the "pre-infusion" water be in the moisten and stir step?
What effects do you get with coarser of finer grinds?
Does the top filter do anything beyond slowing and dispersing the water drops?

Posted July 12, 2012 link

Good questions, John. Let's see...

1) Toddy is considered a "concentrate", so the consumer typically dilutes it with either water or milk before consuming. Cold brew methods like this one do not yield a concentrate, but a ready-to-drink brew. Sure, you can add water or milk — no harm done — but that's not the point.

2) It's difficult to compare the output of this device to espresso, as they're very different things. For one, this method doesn't implement any pressure. Also, the strength is different. For the same dose of coffee (45 g), espresso uses much less water than the cold brew tower. Even the extended brew time (compare espresso's <30 seconds to cold brew's 2-4 hours) doesn't make up for this.

3) The ice is included to keep the water cool throughout the entire process. The goal is to have ice floating in the water the entire time, up until the end, at which point it should be melted. We've been able to achieve this by devoting 25-30% of the total water volume to solid water (commonly known as ice) and the remaining 70-75% to liquid water (commonly known as water).

4) We've used cool water, subtracted from our solid water + liquid water total, for pre-infusion but haven't yet measured the temperature. Using cool water is common, though folks like Lorenzo Perkins recommend high temperatures. Look towards the end of his article.

5) As always, coffee that is more finely ground is more readily extracted. It extracts faster, but also delays the brew time, so if you go too fine you'll probably overextract. Coffee that is more coarsely ground is less readily extracted. It extracts slower, but also quickens the brew time, so if you go too coarse you'll probably underextract. For this method, we've had success with a medium-fine grind: 14-15 on Baratza's Encore.

6) The top filter simply disperses the water, nothing more.

Have fun!

 
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Netphilosopher
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Joined: 14 Jan 2011
Posts: 1,602
Location: USA
Expertise: Just starting

Posted Fri Jul 13, 2012, 11:42am
Subject: .
 

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primacoffee
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primacoffee
Joined: 19 May 2010
Posts: 37
Location: Louisville, KY
Expertise: I live coffee

Posted Fri Jul 13, 2012, 1:13pm
Subject: Re: DIY Aeropress Cold Drip Brewer for Under $30 - How To
 

You're right in thinking that cold brewing forgives — or even favors! — a finer grind. As you said, it's difficult to achieve a bitter brew. We did notice, however, that there was a point at which the grind was so fine that

1] the water pooled at the top (the drip rate surpassed the drain rate, and this problem was made worse by the paper filter resting atop the grounds) and
2] the brew was unpleasantly strong and syrupy. Even at such a strength, though, it wasn't bitter. Not in the least.

And that is what is at risk when you go finer. But for some that's right up their alley.

Regrettably, we didn't record the actual yield. Your estimation is probably pretty close though!

A light tamp does sound intriguing... we'll have to give that a try! Thanks for the tip.

 
Prima Coffee Equipment
http://prima-coffee.com
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Netphilosopher
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Posts: 1,602
Location: USA
Expertise: Just starting

Posted Fri Jul 13, 2012, 1:37pm
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