9 million liters from the depths of the earth
The geothermal water originates 2,000 metres below the surface, where freshwater and seawater combine at extreme temperatures. It is then harnessed via drilling holes at a nearby geothermal power plant, Svartsengi, to create electricity and hot water for nearby communities.
On its way to the surface, the water picks up silica and minerals. When the water emerges, its temperature is generally between 37°C and 40°C (98-104°F). But owing to variables outside of our control – including weather and time of year – the water temperature sometimes fluctuates beyond this range.
Why is it blue?
The geothermal water has a unique composition, featuring three active ingredients – Silica, Algae & Minerals.
The blue colour comes from the silica and the way it reflects sunlight. During summer there can also be a hint of green in the water. This is the result of the algae, which multiplies quickly when exposed to direct sunlight.
However, and this might come as a surprise to you, the water is actually white. If you pour it into a transparent cup, it will always have a milky white colour. The sun simply makes it look blue!
The geothermal water has many benefits. But there are a few things that you should keep in mind.
Keep in mind
- Stay hydrated. Staying in warm waters for long periods can cause dehydration. Remember to drink, before and during your visit.
- Use conditioner.The water does not harm your hair, but it will make it dry. So use plenty of conditioner, before and after you enter the water.
- Remove the jewellery. The water can affect items of jewellery, so please remove them before you enter the lagoon. You can keep them in your private locker.
- Skip the goggles. There is no visibility beneath the surface, so goggles and underwater cameras are unnecessary.
- Bring sunglasses. On sunny days, we highly recommend that you bring sunglasses, as sunlight reflects strongly off the water.
- The water temperature is generally between 37-40°C (98-104°F).
- The lagoon contains 9 million litres of water.
- The water is self-cleansing – it renews itself every 40 hours.
- Blue Lagoon is mostly ca. 0.8-1.2 metres deep. Its deepest point is 1.4 meters.