I emailed the guy the other day about finding the rock. His reply is as follows. Pretty interesting! "I have found rocks in the raw beans several times - I even hand sift the beans before roasting to try a catch any that get past the "de-stoner" machines the coffee plants use to try to prevent this ...

I was using up the last of my 2 week old beans that I picked up from a local roaster with a very good reputation. The espresso shots I have been able to pull from this batch have been great. I was able to find what I felt was close to the sweet spot on my grinder (Ascaso i3-mini)

I have been lurking in these forums for a few weeks and have finally joined this forum. I have recently bought a Saeco Aroma, refurbished, and a Ascaso i3-mini grinder. I have read many post's on the internet about depressurizing the Saeco PPF, yet nothing was very detailed. So, since I did the depr...