Hürlimannbad & Spa Zürich

Hürlimannbad & Spa occupies the former Hürlimann brewery in Zurich's Enge district, where a deep drilling operation in 1976 struck naturally mineral-rich water known locally as the 'Aqui' source, emerging at around 24°C from roughly 270 meters below ground. The brewery used the water in beer production and bottled it as mineral water until the brewery was sold in 1999. The same source now supplies the bath's pools, warmed to between roughly 35 and 41°C, with the operator explicitly distinguishing the water from ordinary treated pool water. Bathers swim beneath the brewery's historic vaulted brick cellars or in a rooftop infinity pool overlooking the city, in a Roman-Irish bathing ritual.