I've got an ECM Giotto around 8 years old. I use Cafiza regularly but have never attempted to descale. It seems to run fine. Local water is not hard and I use Brita filtered water in the machine. Your chart does not show any descaler appropriate for the ECM (now Rocket Brand).
Shoul I descale and with what product? Liz
Durgol is safe to use on almost all espresso machines. I would recommend getting a couple of packs to descale the Giotto because it has suck a large capacity boiler.