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Thread: Acidic extraction

  1. #1
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    Acidic extraction

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi,
    Any ideas why shots pulled in my parents Bezzera domus are very acidic? when using the same beans in my brugnetti the shots have less acidity. So far I have done a thorough chemical flush, checked boiler for scales (was ok)

    thanks


  2. #2
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    Re: Acidic extraction

    acidic sour or acidic tangy?

    if its the sour sort of acidic, then its a case of the beans arent quite ground right for your parents machine

    if its the tangy sort, Well.. Possibly some difference in your machine process is dulling that? I dunno

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    Re: Acidic extraction

    Its a tangy acidic, I thought about the grind/grinder and cleaned the burs just in case and its still pouring fine

    thanks for your thoughts

  4. #4
    Senior Member Vinitasse's Avatar
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    Re: Acidic extraction

    You may be underextracting, as in your shot is completing far too quickly... grind a bit finer, dose a bit more and lengthen the shot a bit... be careful though because if you drag it out too long you will end up with burnt, bitter, overextracted coffee in the cup

    Aim for an extraction of approx 30 seconds, give or take a few

    Good luck

  5. #5
    Senior Member Vinitasse's Avatar
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    Re: Acidic extraction

    oh... and I should have added... make sure the machine is running at the optimal temperature.... give it time to fully warm up before pulling a shot and if in doubt, check the temp of the water at the grouphead... a "workable" range would be somewhere in the range of 89-92 degrees. If the temp never gets above 89 the only coffee coming out of that machine will be acidic and tangy... at best

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    Senior Member coffeechris's Avatar
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    Re: Acidic extraction

    Try a little test have make a cup of extracted waster from the machine (no coffee) also a small amount from your tap. see if there is a difference in the taste.

    From what you have written it sounds like there is still citric acid or what ever you used to flush your machine still in your machine.

    Chris

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    Re: Acidic extraction

    I dont think citirc in the group is the issue because the following shots should have improved

    I didnt think about the temperature tho which will be the next thing to check
    thanks for the assistance

  8. #8
    Senior Member coffeechris's Avatar
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    Re: Acidic extraction

    i was told not to put a descaler through the machine, which i did. the reason why is it can stay inside the boiler. the best netualizer although it takes the longest time is water. I was getting shots and and also steam that altered the taste of the coffee. I worked this out by tasting the water by itself....

  9. #9
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    Re: Acidic extraction

    hmm, the machine was descaled a few months ago

  10. #10
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    Re: Acidic extraction

    Tested the group temp it may be running a little cool but I dont think my method for measuring the temp was very accurate with a milk thermometer* :D
    Now for a slight adjustment

    thanks everyone for the help



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