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Plunger Effervescence?

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  • Plunger Effervescence?

    Just received a new batch of beans from a supplier Ive been using for a number of years, grinding on demand for plunger, but this lot churns/almost overflows in a quite soft-drink kind of way when the water is added - Ive never had this strength of reaction before. Is this something to do with CO2 release from the fresh grind? Any ideas?

  • #2
    Re: Plunger Effervescence?

    if youre grinding as fresh as ever and with the same level of coarseness then id guess its about the bean/blend. possibly more robusta in this latest blend? i dont know if more robusta will give off a bigger bloom in french press. often robustas tend to yield more crema in espresso

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    • #3
      Re: Plunger Effervescence?


      Sounds like it is the CO2, and you got some nice, fresh coffee and/or the supplier has altered their blend.

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      • #4
        Re: Plunger Effervescence?

        I had the same effect when pouring water onto the grinds in the aeropress 2 days after the roast. Doesnt happen 7+ days after the roast. If it doesnt change by Thursday then it may be the beans, but id be guessing the freshness factor.

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        • #5
          Re: Plunger Effervescence?

          Cheers all
          It is nice to know that Im getting REALLY fresh product from these suppliers - worth the extra hassle! (We really couldnt go back to the supermarket now, could we!)

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          • #6
            Re: Plunger Effervescence?

            Yep my guess would be freshness, day 1-3 pretty lively !

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            • #7
              Re: Plunger Effervescence?

              Dont you love it when size of the bloom (the "fizz") is more than the beverage itself :P Just had it then with a one day post roast. It also depends on the bean variety, but freshness is the main factor.

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