A sewage plant near Berlin has found that playing Mozart to its biomass-eating microbes makes them work harder. They expect that it will save the facility as much as €1,000 a month.

The waste-treatment facility in the town of Treuenbrietzen southwest of Berlin has been testing a special stereo system over the past two months after an Austrian waste treatment plant said that Mozart made their sewage-eating micro-organisms perform better, helping to cut costs.

The process was developed by Mundus, a small German firm in Wiesenburg in northeastern Germany.

According to Anton Stucki, a founder and managing partner of the firm, the sonic waves of Mozart’s compositions spur micro-organisms to a higher performance in breaking down biosolids. As a result, wastewater facilities can save energy costs and decrease the amount of residual sludge, which is expensive to dispose of.