Water Testing with Coffee Collective Crew

This week I had the opportunity to do water cupping with coffee collective crew down at the newly established roastery in Copenhagen.

We had 3 different sources of water and ran a blind cupping session, with 2 different coffees (Kariaini and Finca Vista Hermosa) . We had reverse osmosis filtered water that has been totally purified, bottled Eden spring water and “water + more” tap filtered water which Klaus was particularly interested to test out.

This filter has a four-step filtration system, standard water purity filter, carbon filter (removes odor and bacteria), ion filter (removes calcium) and an extra fine 10 micron purity filter. You can also regulate the bypass. As well as a one-way valve, making it extremely easy to change without having to shut off the main water system. Mind you - this filtration system was especially designed for coffee.


As it was blind cupping we didn’t know which water was which. The difference between the cups was remarkable. The two standouts ended up being the spring water and the “water + more” filtered water. The pure water was simply too boring. Filtered tap water had a little feel of slightly carbonated water with a little bit of mineral sparkle which retained the natural acidity and perhaps enhanced it on the palate. Spring water was outstanding also bringing a lot of natural profiles out of the coffee.

The most remarkable thing about this filter is that it will produce the same results no matter there you are in the world (with proper tuning) providing that well-needed consistency through out clientele that many roasters would like.

We had the opportunity to try unfiltered tap water along side “water + more” filtered water. It is most certainly not drinking water; it almost tastes like flat mineral water due to a high content of CO2. It wasn’t very pleasant to drink but it works fantastic with coffee.

The guys from coffee collective were very happy with this system and are going to introduce it to all their customers, so there is consistency in water quality throughout. Klaus wrote his thoughts about this filter on his blog also, so be sure to check it out.

This cupping session was a real eye opener for me, the water is undoubtedly the most important aspect in quality, and so it is absolutely critical to install the right filtration system to get optimum results.