Both filters and the holders for filters should be as hot as possible when you’re preparing coffee. For this reason they should always be interested into the group; this way the stable temperature required for preparing espresso can be reached. When the barista loads up another portion of coffee, the filter should be clean and dry.

Other things to keep in mind include:

*Before inserting the holder into the group, it’s necessary to carefully remove ground coffee from the filter edges.

*After the holder is inserted into the group, it needs to be turned with the appropriate force (it’s necessary for achieving the ideal tightness in the group)

*The best time to prepare espresso is immediately after inserting the holder. In the filters and holders, coffee oils accumulate, so they require regular cleaning.