The New Filter For The Ultimate Espresso Experience! The Brita C150 Purity Finest Filter Cartridge is designed for the preparation of the best espresso. PURITY Finest optimised water, with its ideal mineral composition, releases the typical aromas from the ground coffee and thus supports the development of the body and the typical espresso taste. In addition, substances that have an adverse effect on the taste and aroma are reliably filtered out. Furthermore, the water allows a goldenbrown, stable crema, with a colour and consistency previously unachieved, to develop, and in the process makes the enjoyment of coffee perfect ? not just for espresso, but for all other espresso based coffee specialities.