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Thread: Silvia: Matallic Shots

  1. #1
    JR
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    Silvia: Matallic Shots

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    While I am generally satisfied with the extraction from Silvia I canít seem to produce a rich sweet shot like the ones made at ease during the coffee training last month. *It doesnít seem to matter what I do I canít eliminate a metallic taste to my shots.

    I believe my dose, distribution and tamp are adequate, beans are freshly home roasted and I have temperature surfed to various degrees to no avail.

    Last night I did a bit of an experiment where I drew water from the boiler via both the stream/water wand and the group head. *I let the water cool to room temperature and sampled them. *The water from the wand tasted like normal water where from the group it had a metallic taste.

    I did a chemical back flush last week along with a good clean of the general group area. *I proceeded to remove the shower screen, clean the group and repeat the experiment this time drawing water directly from the group without the shower screen. *Still metallic.

    I put a citric acid solution through the boiler and again repeated, better but still a noticeable difference between the two samples.

    Is it possible to have some remnants from the production process lodged in the group imparting a taste to the water? *What should I do from here?

    Any comments would be appreciated.

    Dan

  2. #2
    Senior Member fatboy_1999's Avatar
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    Re: Silvia: Matallic Shots

    Dan,

    Have you soaked/cleaned the actual group handle?

    When I do the water backflush weekly, I also soak the group handle in a small plastic bucket filled with a little espresso cleaner and warm water. I just stand the handle up so that only the metal bits are under water, leave it for about 30 minutes and then rinse thoroughly. I also put any of the baskets Ive used during the week. Im always amazed at how shiny everything looks after such a short soaking.

    Perhaps the group handle has got some build up (in spouts perhaps). Give it a soak or failing that, try to get some pipe cleaners (or similar size things) and see if you can scrub the spouts out.

    Hope that helps.

    Brett.

  3. #3
    JR
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    Re: Silvia: Matallic Shots

    Yeah thanks for the tip Brett. When I was actually performing these tests the water was extracted without a portafilter to avoid exactly that. I wanted to test the actual water from the group before it was potentially polluted from external sources.

    Dan

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    Re: Silvia: Matallic Shots

    Dan,

    afraid this is odd and should be referred to your supplier...ie take the machine in & ask him ( her) if he (she) would do exactly as you have done & or make a coffee or two, and taste. Do you have that kind of relationship with your supplier that he would do this on the spot for you without asking you to leave the machine?

    I cant see any reason why this should be happening....there is no metal in the guts of the thing that should be "leaching" into solution with the coffee, and built up coffee oils in group handles or anywhere else would not cause this. Nor will a build up of scale. Or, this could be a result of using back flushing detergent and not flushing it away enough at the end of the cycle and residue has dried up inside.

    OR,

    an absolutely great thing to do would be to get together with another couple of Silvia owners in the group and compare to their machines....maybe they all do this, or you will truly work out that yours is doing something it shouldnt in which case it should still be referred to your supplier.

    Just a few thoughts out loud.

    Hope this helps,
    FC.

  5. #5
    JR
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    Re: Silvia: Matallic Shots

    Along with Ďmetallicí tasting group water, I have noticed tiny black particles in the water being expelled through the group and the problem has been growing over the last few weeks. I donít believe these particles are ground coffee because they easily flow through the filter basket. After 3-4 flushes from the group almost all particles in the espresso glasses are gone but as soon as I pull a shot they are back. This is despite a clean of the shower screen and group head between expelling water, what is going on?

    I took it back to Mocopan this morning to diagnose the problem and they said it was Ďnormalí. I very much doubt that between 10-50 foreign particles in a shot of espresso is normal but they would not even contain the notion that anything was wrong.

    Does anyone else have black floaties when pulling blank shots?

    Dan

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    Re: Silvia: Matallic Shots

    Hmmm,

    I dont backflush my Silvia; I simply clean the showerscreen every week, and make sure all the components are clean. I have a few friends who backflush with various substances...they all have trouble with strange flavours in their shots...

    I dont have the amount of floaties that you have in your shots; maybe one or two at most....

    Try just running two or three tanks of clean water through the system (the right way), and see if the metallic taste persists...

    Cheers.......

  7. #7
    Mal Dimal's Avatar
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    Re: Silvia: Matallic Shots

    Quote Originally Posted by stratford link=1125364270/0#5 date=1126158378
    Hmmm,

    I dont backflush my Silvia; I simply clean the showerscreen every week, and make sure all the components are clean. I have a few friends who backflush with various substances...they all have trouble with strange flavours in their shots...

    I dont have the amount of floaties that you have in your shots; maybe one or two at most....

    Try just running two or three tanks of clean water through the system (the right way), and see if the metallic taste persists...

    Cheers.......
    Hi All,

    I backflush my Mokita with Plain Water every two or three days and with Espresso Cleaner once every 4-6 months to remove coffee oils build-up... When I do this one, very little grunge is expelled as I believe the water only flushes are doing a pretty good job.

    One thing I do pretty religiously though, and that is to soak the PF, basket(s), etc in Cleaning Solution and then thoroughly rinse off. Failure to do this definitely has a negative impact on the quality of the shots pulled, in that they start to develop a really foul taste.

    Regarding the "black particles" in the water when you flush water through the Group with or without the PF in place. Im pretty sure that this will be particles of "spent" coffee grounds that have worked their way through the water circuit in the Group or the 3-Way Valve. Even the very best of Grinders will still produce a certain proportion of "fines" but not necessarily what could be termed "dust".

    These fines are small enough to make it through the PF basket(s) and back up through the Shower-screen, etc. By Back-flushing with water only, most of this will be flushed away into the Drip Tray and by cleaning your PF and Baskets(s) regularly, you will avoid building up a collection of fines, rancid oils and other yucky stuff. Theres a very good "How To" for Back-Flushing on Randy Glass website here...http://tinyurl.com/d9qaz and I would recommend reading this before getting stuck into it.

    Hope this helps out a bit,

    Cheers,
    Mal.

  8. #8
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    Re: Silvia: Matallic Shots

    Behmor Brazen - $249 - Free Freight
    Yes Mal,

    Sounds like a good routine... I think some of the so called `espresso machine cleaner available on the internet and other places is just rebadged dishwasher powder or the like...one particular brand comes to mind....

    You dont want any of that stuff left in the system....

    Cheers,

    Chris



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