Near Bad Bertrich, in the district of Kennfuss, hikers will find the" Maischquelle". It is a so-called layer spring that emerges from the mountain. Such springs can be found wherever comparatively young volcanic loose deposits lie on top of old rocks from the Devonian period. Here at the "Maischquelle" you can see very clearly how the water that seeps away on the surface but cannot penetrate through clay and shale thus emerges again at the surface of the deposits. It is precisely at this transition from the dark volcanic rock to the lighter rocks of the subsoil that the water drips out of the wall.
During this percolation process, the water is filtered. In general, the thicker the volcanic deposits are up to the point of exit, the cleaner the spring water emerges from the wall. Unfortunately, they are not thick enough at the "Maischquelle" to meet drinking water standards in current use.
Hike along Georoute path no. 5 and you will reach the ”Maischquelle”; the “Maare und Thermenpfad” also passes by the spring.
Further information can be found in the brochure: "Dreese - Mineralwasser- und Kohlensäurequellen der Vulkaneifel".