First and most important, the coffee you use in a melior pot (the name of a french press, and not the brand name) must be coarsely ground. There is no other way; if you use coffee ground as for regular drip, you will get a fine silt, like Turkish coffee. Was this your experience? Well, we grind our own beans using a burr grinder, and I'll agree that this is highly important. Some coffee geeks even insist on roasting their own green beans, but we're not that hard-core. I don't know about the "twice as much as the machine's instructions recommend" rule of thumb, though; we just use a standard coffee measure per mug (12 fluid oz.), which I believe comes out about the same as the manufacturer's instructions. I'm inclined to agree, since we use a Krups 12-cup drip that's served us for years; however, we do clean the machine periodically using white vinegar which we run through twice; this is to remove calcification buildup.