Table 1. Nespresso machines sampled in this work.

Sample n°.	Machine model	Use*
1	Essenza	Communal (12 uses/day)
2	Pixie	Domestic (3 uses/day)
3	Essenza	Domestic (2 uses/day)
4	CityZ (capsule container)	Communal (10 uses/day)
5	CityZ (drip base)
6	Essenza	Communal (20 uses/day)
7	Inissia	Domestic (4 uses/day)
8	Essenza	Communal (10 uses/day)
9	Pixie	Domestic (4 uses/day)
10	Pixie	Domestic (3 uses/day)
11–30	Inissia (Krups)	This work (3 uses/day)

^*Frequency of use indicated in parenthesis as the average number of uses per day, as stated by the users of each machine.