Water filtration is an essential process for improving the taste of coffee and protecting espresso machines. The quality of your water, and therefore the quality of your coffee, is determined by the water filter that you use. All mains water needs some form of filtration to be suitable for coffee brewing, but the specific filtration system required depends on the impurities present in your tap water. The importance of water filtration lies in its ability to remove hard water, which can cause limescale to build up in the boiler of the espresso machine, reducing its efficiency and potentially damaging it. Water filtration can also remove chlorine and other contaminants from the water, improving the flavor of the coffee. It is important to choose the right filter for your specific water source and needs.