The water supplies for the lagoon run straight from the National Power Company´s
bore hole in Bjarnarflag. The water has a temperature of about 130°C when it
arrives to the huge basin beside the lagoon itself forming an impressive,
man-made hot spring. Altogether, the lagoon and the basin contain around
3.5 million litres of water with a temperature of 36 – 40°C.
The lagoon itself is a man-made construction, its bottom is covered by sand
and gravel. The characteristics of the water are unique in many ways.
It contains a large amount of minerals, is alkaline and well suited for bathing.
Due to its chemical composition, undesired bacteria and vegetation do not thrive
in the lagoon making chloride or any other disinfectant redundant.
Geothermal water in Iceland usually contains some sulphur. In this area the
strength of the chemical is greater than others. Therefore is should be avoided
to take jewellery from brass or silver into the water, they become black and can
be damaged. Sulphur, however, is considered to have a positive effect on asthma
and other respiratory diseases, and many of the trace elements in the water are
considered to have a good effect on the development of skin problems.