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Thread: Properly descaling EM6910 steam thermoblock

  1. #1
    Junior Member
    Join Date
    May 2018

    Properly descaling EM6910 steam thermoblock

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight

    I own and service several EM6910 machines at home and work over the past few years and thought i should pass on some info i have learnt about this machine.
    For the last two years i have taken the work machine home every 6 months to descale it with a 20% solution of citric acid and replace the collar or seal as needed.
    Its been three years now and i have noticed that the steam quality has continued to degrade even though i was descaling it.

    At this same time i also purchased two more em6910's off gumtree for $40 and both werent working due to blocked steam.

    This time i decided to remove the steam thermoblock from all of them and have a look inside.

    This thermoblock had citric acid sitting in it for two days and it didn't do anything.

    Next step was to use something stronger and much more controversial. Hydrochloric acid.

    I put the thermoblock in a water back to reduce acid attack to the outside. It took about 5 minutes of 30% hcl, pumping the syringe back and forth to disolve the scale

    This method was very successful and has minimal if any attack on the aluminum

    Its really hard for me to get a photo of inside the thermoblock but i promise it made a massive difference.

  2. #2
    Junior Member
    Join Date
    May 2018
    Sorry, i didnt realise my photo links didnt work the first time.

    Before descale

    Descale method

    After descale

    rawill and topshot like this.

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