The crystal clear thermal water is drawn from two deep bores. The spring is pure soda water, extremely soft, odorless and contains no sulfur.

The pleasure of being enveloped in pure thermal waters and the health benefits that it offers is widely recognised. Hot spring soaking has a long history. Romans and Egyptians used mineral baths for therapeutic purposes as early as 2000 BC. In Europe and Japan doctors use the healing powers of mineral springs to treat a wide range of conditions. This practice is known as balneology and is very much part of routine medical care. Mineral water flowing constantly through all Fernland Spa hot pools rises from a deep underground aquifer. It originally fell as rain thousands of years ago, it then seeped deep into the earth where it becomes heated by hot volcanic rock. As the water interacts with the volcanic rock it becomes heavily laden with minerals, trace elements and ions. The hot water then rises close to the surface and from this source we are able to continuously channel pure water into our hot pools.

Fernland Spa Mineral Hot Springs have been classified a true mineral spring as assessed by the New Zealand Institute of Geological and Nuclear Science.