We have long tried to emphasise the importance of high quality brewing water when brewing our coffees, or any coffee for that matter. Water makes up more than 98% of a filter coffee, and around 90% of an espresso, so the water chosen makes a huge difference to all aspects of the final character of the brew. Not only this, but the balance and level of the water’s mineral content makes a huge difference to what characteristics we are able to extract from a given coffee. Dissolved minerals in water exist as charged ions, which help us to bind to the flavour compounds that lead to the most exciting and involving cups. But balance of each is important, too much of one type of ion, and we can end up with a sharp and sour cup, too much of another, and the coffee is flat, dull and lifeless.
Professional level filtration for the home
In any serious cafe, you’ll find a filtration system that forces water through various chambers and resins in order to reduce the hardness, both to protect equipment from scale and to enhance the taste of coffee. The hardness of the water sent to the machine can then be controlled using a bypass; mixing the some tap water back into the softened filtered water, allowing control over the flavour characteristics extracted in the final cup. The Everpure systems we use in our cafes accomplish this perfectly, but they’re also very complex, expensive and unsuitable for most home use environments.
Adjustable bypass system
For the first time, Peak Water’s groundbreaking new adjustable filter allows you to customise your water for coffee at home without an expensive commercial system. Peak uses an innovative disc filter, combining precisely calculated flow dynamics with a system they have dubbed the ‘filter maze’. The maze ensures that the water flows through the filter in a specific way every time, allowing the specific ion-exchange resins to control and manipulate mineral content consistently. The focus is on controlling the level of bicarbonate, the variable with the greatest impact on a coffee’s cup quality, while balancing the water’s pH level and creating a mineral makeup with great brewing in mind. With each Peak starter pack you will receive a testing kit that measures the level of bicarbonate in your source water, used to suggest an initial bypass setting for the jug. Here in Copenhagen, the tap water is very high in bicarbonate, so the strip suggested the lowest possible bypass setting, but we have seen success at several settings, experimenting with creating different hardnesses of water, unveiling different characteristics in the final cup, especially in espresso.