works very well, you put it in the espresso machine overnight and rinse it in the morning after. i use it also for my kettle works well too.
Super Pack 25(1oz Packs)
Note: It is recommended that you use this product every three months for all espresso machines. If your machine has a descaler indicator, you may descale when the indicator appears. If your indicator takes longer than 3 months, it is recommended that you descale every 3 months.
Descaling your espresso machine will keep your coffee tasting great and will protect your machine for lime scale related issues.