Experts disagree on whether the Wallender Born can be described as eruptive course, but periodic gas outbreaks have been witnessed since time immemorial.
The fountain is operated geyser-like: The artificial conduit is located below the water surface of a small pond.
An eruption lasts about 5 minutes and is divided into another two clearly distinguishable phases: The first of these two phases will take about 10 seconds, the water from the vent, and possibly underground existing reservoirs, depending on groundwater level and air pressure results in a 2–4 m high water column (maximum) being ejected.
Wallender Born is the result of volcanic activity seen in the Eifel region, although the shape of the eruptive source is not a direct consequence of geothermal energy, but of the escape of carbon dioxide.
From the magma in the crust volcanic gas rises through cracks and fissures in the earth's surface and dissolves partly in the ground water to carbonic acid.