The 2nd pipeline was opened in 1910 and also drew its water from the area of the Styrian-Lower Austrian Limestone Alps, being fed from sources in the Hochschwab region near Wildalpen. The largest spring is the Kläfferquelle at the foot of the Hochschwab, in Styrian Salza valley. This spring supplies 860 million litres per day during the thaw, four times more than can be transported to Vienna through the pipeline.