A specialized cleaning powder formulated for professional brew group cleaning, ECM's Brew Group Cleaning Powder is ideal for removing built up coffee residues in the brew group of your machine. The cleaner removes flavor killers like built up oils and fats, leaving you with great tasting espresso. The cleaner can also be used to remove buildup on portafilters as well. This product is not a decalcifier and should not be dissolved in a reservoir or put through a boiler.