Delonghi EcoDecalk 500 ml. Decalcifier for coffee maker, replacement compatible for coffee machines 5513291781 - AliExpress
Amazon.com: De'Longhi 5513292811 Water Filter, Pack of 1, White & EcoDecalk Descaler, Eco-Friendly Universal Descaling Solution for Coffee & Espresso Machines, 2-Pack (1 use per pack): Home & Kitchen