The construction industry's Bygg.no has written about the project here: Sør-Aurdalshallen.
Project manager Oddleiv Juvkam for Sør-Aurdal explains why they chose a steel pool, after they initially intended to go for tiled concrete pool.
Selected steel basin over concrete
"Maintenance costs were an important factor in the choice, but you also avoid some pitfalls. For example, it is quite easy to damage the tile pool if the water is drained too quickly. You do not have to think about that with steel. In addition, it is easier to repair, states Juvkam" Ådne Homleid, Bygg.no (http://www.bygg.no/article/1423699)
Enwa Badeanlegg was in charge of design, assembly and coordination towards adjacent construction areas.