The group head is the device where water is forced through the coffee grounds that sit in the portafilter at an ideal temperature and pressure to produce a well-balanced espresso. But the group head won’t distribute water evenly through the coffee grounds if lingering coffee residue isn’t cleaned from the filter screen of the group.
Step 1 — Insert the blind basket into the portafilter.
Step 2 — Add 3 grams of Cafiza into the portafilter using the Scoopz dosing tool (1 scoop = 1.5 g).
Step 3 — Insert the portafilter into the group head.
Step 4 — Activate the brew cycle for 10 seconds. Stop the cycle after 10 seconds. Repeat this step 5 times.
Step 5 — Remove the portafilter from the group head. Activate the brew cycle and rinse the portafilter in a stream of water from the group head.
Step 6 — Insert the portafilter, still with the blind basket, into the group head without adding any cleaning product. Repeat Step 2.
Step 7 — Remove the blind basket from the portafilter using Portatoolz.
Step 8 — Insert the standard portafilter basket.
Step 9 — Brew a cup of espresso and discard it to ensure no residue remains.