This pilot study began in September 2016 at WTW Lövo of Stockholm Vatten, and investigates the use of SIX®, ozone, ILCA®, and CeraMac® membrane filtration for treating water from Lake Mälaren. This Lake is the biggest Lake in Europe and the main source for the drinking water utilities in the Stockholm area. While the overall water quality of this Lake is excellent, it contains relatively high levels of humic and fulvic acids which give a brownish color to the water and needs to be removed. Initial test results suggest excellent organics removal by SIX®, and the need for coagulation for sustainable membrane operation. If the trial is considered successful by Norrvatten a pilot will also start at WTW Görvalnverket of Norrvatten.