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Thread: Cloudy / murky Aeropress

  1. #1
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    Cloudy / murky Aeropress

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    We've been enjoying aeropress at the office for the past 6 months and it's been fantastic.

    Over the last couple of weeks, the brews have come out less clear visually than they used to, kind of a murky / cloudy appearance.

    I've tried a different grinder and different beans but just can't get rid of the murk.

    It's not tasting as sweet either.

    Anyone got any ideas where to start troubleshooting?

  2. #2
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    If you are using the paper filters is it possible that they have become contaminated somehow? Alternatively are you using a new pack of filters?

  3. #3
    Mal Dimal's Avatar
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    How's the water temperature "rustla"?

    Mal.

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    We're using the same paper filters.
    I tried adding a second filter to the brew, hasn't helped.

    Is this sort of problem typically filter? May be worth trying one of the metal disk filters instead of paper.

    Water temp is 93C according to the Bonavita variable temp kettle.
    I've spilled enough water on myself lately to know that it's pretty hot (though my hand doesn't have a thermometer, just a pain threshold)

  5. #5
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    Metal disc is the way to go. I bought one about a year ago and it instantly improved by aero press brews very slightly, but more importantly made them consistent

  6. #6
    STS
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    If possible try to check water temp independently of what the kettle is telling you (i.e too hot will over extract = effecting 'sweetness'), maybe try slightly courser grind. Do you filter you water or is it straight out of tap? If water authority has needed to change their additive amounts or recipe to make water safe these additives could interact and change brew in unfiltered water. Something else you could try is use the same water/coffee/kettle/grinder and use a different non-espresso method such as pour over/French press to try and rule out certain variables. I would have thought that in the absence of an obviously contaminated filter paper, rinsing the aeropress filter paper thoroughly prior to use would rule this out as a cause of your problem.

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    Have got the fine metal disc and no difference. I was told when I bought it to expect a cleaner taste in the cup, looking forward to that when we resolve this.
    We use bottled water from a water cooler. The water looks clear and we're all drinking from it.

    Out of curiosity I've brought the aeropress home and tried, I have the same model kettle at home and the same batches of beans.

    I swear it's a cleaner look and taste.
    Given that we're always using bottled water, is there any maintenance to be done on a Bona Vita gooseneck variable temp kettle?

    I'll need to get a thermometer and test the actual temperature.

    Thanks for all your suggestions so far

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    Talking

    Hi. I've not used my aeropress that much yet, but one thing I have noticed is that if I push down the plunger quickly by applying heavier pressure then the brew is a tad cloudy. By pushing down gently and slowly the brew is bright and clear. The slow method takes 60 sec, which means I start pushing down 60 sec before the target total brew time. Not sure it matters, but I use the inverted method and use pre wetted paper filters. Hope this works for you too

  9. #9
    Mal Dimal's Avatar
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    Quote Originally Posted by rustla View Post
    I'll need to get a thermometer and test the actual temperature.
    Excellent stuff...

    Only way to be sure. You could also use the CS Digital MultiMeter with a t/couple probe if you have one. Just a bit easier...

    Mal.

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    You said you got a metal filter some time back, I believe that Able has released a disc more recently that has smaller filter holes. If you combine that with a coarser grind, you should sort that cloudiness out.

    Did you use a defferent grinder between the home, and the office? It sounds like you have a lot of fines in the grind, you could even get a fine sieve and tap out the fines, then re-dose the appropriate weight once the fines have been separated out. You should get a cleaner cup, and better clarity of flavour with this technique.

    In my experience, for a 200g yield of liquid, pressing time should be 15-20 seconds for best result, and the appropriate coarsness. Hope that helps!

  11. #11
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    Behmor Brazen - $249 - Free Freight
    i have almost used all the filter papers that came with my aeropress and the only time i get a murky brew is when i push too hard and some of the grinds slip through the edges. the solution is to adjust your grind/brew time and accept that the aeropress isn't an espresso machine. u got to remember that its air pushing the water down, so there is no need to force it down in a hurry. i also used to get silt like grinds that would block the filter from a cheaper inconsistent grinder that i have since replaced. good luck!



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