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I have a Rancilio Silvia and a Breville Conical Burr Grinder. We roast our own beans using a Behmor 1600, and typically do kinda light roasts. Very often, regardless of the bean, roast, packing pressure, or grind size (as far as I can tell), our bottomless filter sprays coffee all over the place. Occasionally, it works fine, but the vast majority of the time it sprays at angles that I thought were impossible (i.e. approaching 90˚ to vertical). Has anyone had this experience and do you have any suggestions for fixing it (or even troubleshooting it)?

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    Seems like either very high boiler pressure or calcified portafilter. My two cents: Check pressure first. If set correctly, thoroughly decalcify the machine and the filter. – MTSan Sep 19 '18 at 23:06
  • Do you have the same issue with pre-roasted beans? I presume that there isn't any coffee grind in the sprays? Water loves to attach itself to surfaces (surface tension, capillary and intermolecular forces), there can be many reasons suppose; once the initial path is established the rest will - unfortunately - follow. Having a clean, dry filter is step 1. What kind of filter is it? Do you maybe have a picture of the (bottom side) of the filter? – Maarten Bodewes Sep 21 '18 at 13:10

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