Cafes backflush to clean both the showerscreen/dispersion disc area and and the solenoid and passages. If you have a brass dispersion disc on your Gaggia, you may as well take full advantage of the cleaning action when doing a chemical backwash
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Cleaning and descaling a Gaggia Classic
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Give it a test sometime if you have a Gaggia Classic. Do the chemical backwash then take off the shower screen and dispersion disc and have a close look if it is clean enough for you. It never was for me but different people have different standards of how clean they want their Gaggia Classic.
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My Classics both had aluminium dispersion discs so there's no way I ever would have done a chemical backwash on it with the showerscreen and dispersion disc attached.
I do maintain my HX machine this way and can get the showerscreen and dispersion disc satisfactorily clean with a thorough chemical backwash every couple of weeks. I do pull off the showerscreen and dispersion disc a couple of times a year to check the group seal and give them an extra clean while they're off but they're not at all bad.
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