Backflushing the Rancilio Silvia

Backflushing is something to do occasional. Not everyday on a domestic espresso machine. The process is pretty generic and can be adapted to other espresso machines.


This post is about backflushing. Please note two things about that:

  1. Backflushing is only possible in a three-way valve espresso machine.
  2. Rancilio Silvia IS a three-way valve espresso machine, and can be backflushed. BUT Rancilio does NOT recommend to backflush the Rancilio Silvia. I guess the reason is, that backflushing can damage the machine, if done in the wrong way. Rancilio don’t want to extend their varanty to damage caused by improper handling of the machine. So following the advise here is on your own responsibility.

If you don’t clean, your espresso machine, you will gradual discover, that you can’t control the taste of the coffee: different coffees will taste the same, and they will all be more bitter than desired. Furthermore the espresso machines valves won’t work as precise as necessary. The coffee brewing process causes residues of coffee, oils and coffee beans to fasten on surfaces in contact with the coffee. This includes parts inside the machine, where the remains from the brewing process is sucked back when turning off the pump, when ending a brew.  There is nothing you can do to prevent that from happen.

Backflushing – step-by-step


There are a few things you need to have in place before you start a proper cleaning process.

You need the following for backflushing:

  1. A blind filter. It has the same size and form as the normal coffee filter, you use; but without holes.
  2. Espresso machine cleaning detergent. As seen below, I use Puly Cafe Polvere.


The espresso detergent is quite aggressive on oils (to attack coffee oil residues). So make sure it only is exposed to the necessary parts of the machine.

  1. Take off the cover of the drip tray, so you can see the drip tray below.
  2. Fill the blind filter with one tablespoon espresso machine cleaning detergent, or the amount recommended for the special detergent you use. 
  3. Attach the portafilter, with the blind filter and detergent, on the espresso machine, as normal.
  4. Turn on the pump, as normal, when brewing a cup of espresso coffee.
  5. You hear the pump start, and after 1 – 2 seconds it changes sound. Wait 3 – 5 seconds and turn off the pump. NOT LONGER THAN THAT!
  6. You should see excess water, with detergent shortly flush down into the drip tray through the security pipe.
  7. The excess water will be brown or black if you haven’t back flushed the machine for a long time.
  8. Wait 5 – 10 minutes for letting the detergent work inside the machine.
  9. Repeat 2 times, waiting 5 – 10 minutes in between.
  10. When you take off the portafilter, it will contain some brown water.

Portafilter wiggle

After  that, you need to clean the fitting between the portafilter and machine.

  1. Put a new spoonful of detergent in the blind filter and set the portafilter in place, but don’t fasten it in the tightest position. Hold it with your hand.
  2. Engage the pump again, as before; but wiggle the portofilter back and forward, while the water flows over the edge of the filter. Be careful if the water is hot!!! The water will splash.
  3. Stop the pump and take off the portafilter.

And now the rinsing

  1. Take the drip tray out and rinse it.
  2. Rinse the portafilter and blind filter.
  3. Attach the empty rinsed blind filter and portafilter to the machine.
  4. As before:  Engage the pump. You hear the pump start, and after 1 – 2 seconds it changes sound. Wait 3 – 5 seconds and turn off the pump.
  5. Repeat 2 times
  6. If the excess water is still dirty, do the whole back slushing process again.

That is the basic backflushing. For completing the cleaning, you also have to rinse the filter and portafilter inside:

Cleaning the portafilter and the filter

  1. Put one tablespoon espresso machine cleaning detergent in a small bowl with water. The bowl should be just big enough  to contain the portafilter and the filter. Adjust the amount of detergent according to advise given for your specific detergent.
  2. Let the portafilter and the filter stay in the water and detergent for 1 hour, or the night over.
  3. Take the portafilter and filter out, and rinse them properly with tap water.

The Rancilio Silvia as new

To be sure that every residues of detergent is gone: brew one cup of espresso with some old beans and throw it out.

If you haven’t been through this cleaning process before, you will experience that your espresso is better and less bitter.

How often?

We use the machine twice every morning for a double espresso, and 6 – 10 times every weekend. My experience is that after a month it’s time to give the Rancilio Silvia a cleaning.

8 Responses to “Backflushing the Rancilio Silvia”

  1. Gareth

    Where can I buy a new blind filter for the Rancilio in the UK?

    • erik

      Hi Gareth,

      I bought mine at: “”.
      I also bought the cleaning powder at
      Prices are reasonable and they deliver quickly.

      Best wishes

  2. Harry

    Thanks for writing that up… been wondering quite why I couldn’t back-flush the old girl (10 years soon!)

    Think the pump is starting to fail so will de-scale and see if it changes back to its old self…



  3. It’s amazing how few of the large coffee shops don’t clean their machines regularly enough, resulting, as you say, in inconsistent flavours.

  4. Neil

    Great instructions – I followed it and it worked perfectly. The coffee tastes so much better now! I wonder how many of the big coffee chains do this regularly?

    Quick question, can you recommend any brands of cleaner to use?

  5. Ahmed

    Is the black rubber round thing :-) that blocks the filter to be used for backflushing good enough?

  6. If you tried serving coffe from a dirty machine here you´d probably get lynched.

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