Normally I descale my DeLonghi 3500 with the DeLonghi Entkalker EcoDecalk. But since the AEG Entkalker costs only half, I've tried this. Even when descaling could see that only "flushed" a fraction of the amount of lime from the machine was, as with the DeLonghi descaler. Therefore, I have a second round, then with the DeLonghi Entkalker started. There was still a large amount of lime removed from the machine. Conveniently's just not the same well. My machine would anyway calcify hopeless with the AEG descaling agent.