1. If your machine supports it, use the Delonghi DLSC002 Coffee Maker Water Filter. This filter protects your machine from excessive limescale formations and removes impurities from the water that can negatively affect taste. This filter should last around three months under normal conditions and should be replaced to reduce the frequency of your descaling.
2. An alternative to the DLSC002 is to use Third Wave Water (TWW) Espresso Machine Profile. These packets of minerals when added to distilled or reverse osmosis water creates the ideal water makeup from the start. With a balanced water profile and no limescale causing minerals, TWW will help keep your coffee tasting great while protecting your expensive equipment.
Try Third Wave Water following this link https://thirdwavewater.com/delonghi
and use the code "delonghi" at checkout for a 10% off in your first purchase.