Researchers investigated using membrane technology to purify highly colored raw water from Lake Muskan for drinking water production in Nynäshamn. They tested different membranes in a pilot plant and found that nanofiltration effectively removed color and organic matter, maintaining a high membrane flux. Cleaning the membranes with detergent every other day was successful. Disposing of the membrane reject into the sewage system was not feasible due to increased load, so they suggested purifying it with ultrafiltration and using it for irrigation. Despite a slightly higher cost, the membrane technology provided improved and consistent drinking water quality without the need for chemicals, aligning with global trends in water treatment.