BRITA WATER FILTER
Given water makes up 95% of an espresso, filtering the water supply correctly is extremely important - not just for the taste of your coffee but also to avoid build up in the machine. The most important factor is having a neutral pH of 7: less makes the water acidic and more makes it alkaline. Brita water filters have been designed to produce water at a consistent pH of 7.
The Brita filters also remove a number of substances in the water such as chlorine which will oxidise aromatics and oils, iron which affects flavour and colour, and high concentrations of calcium and magnesium which if left in the water will lead to scale deposits that will ultimately cause costly repairs to you machine. To see how the Brita water filters work have a look at this video, and then talk to your coffee roaster about which filter is best for you.