The Heinrich-Franz fountain comes from Großköllnbach in Lower Bavaria. The spring has its source at an untouched depth of 147 metres. State-recognized as mineral water since 1987 and, according to medical reports, particularly suitable for drinking cures. Water from the Heinrich-Franz fountain is used for both Grokj mixed drinks and Egerer beers. Großköllnbach is a part of the municipality of Pilsting. It was an independent municipality until 1978.