Salt production on the isle Læsø began around 1000 years ago and continues today thanks to a unique phenomenon of nature.
In the autumn and winter, the sea washes over the sandy meadows at the southern end of Læsø. Sea water seeps through the sandy soil and becomes trapped by a layer of solid clay below. When the warmer seasons arrive, the sun evaporates volumes of water and a brine forms in the sand. After a number of years, the brine has a salinity of 12-16%, compared with 2-3% in the seas around Denmark. Wells are then drilled to extract the brine.
At an old-fashioned saltern, the extracted brine is poured into large iron cauldrons and heated to 80-85° C. When the heated brine reaches its saturation point, 26% salinity, salt crystallizes on the surface. Salt is skimmed off and placed in large baskets to dry.
The residual brine contains 26% salt, the same concentration as the waters of the Dead Sea. The liquid also contains magnesium, calcium, iodine and other beneficial minerals that all go into Læsø Saltcare products.