HG coffee machine descaler - based on citric acid - fast and safe - for 6x scale removal HG coffee machine descaler has been developed especially for removing scale from different types of espresso and pod-coffee machines. HG coffee machine descaler works safely and quickly; it is odour-free and fully biodegradable. With regular use of HG coffee machine descaler, the coffee continues to taste good, the machine retains its speed, and you extend the life of your espresso or pod-coffee machine!