On the edge of a small town in central Poland, three wooden towers stretch far into the distance. These are salt graduation towers which for over 200 years they have been part of a natural evaporation system, helping process salt brine from an underground well.
The brine enters Tower I (648 metres long) with an initial salt concentration of around 6%. At the top of the 16-metre structure, channels distribute the brine evenly, dripping it down through walls of Blackthorn branches, with sunlight and wind helping to concentrate the brine to 9%.
The brine then flows to Tower II (719 metres long) where the process repeats, further purifies the brine to 16%. The evaporation process releases iodine, sodium, and chlorine into the air, creating a mineral-rich environment long believed to have many health benefits.
Finally, the brine reaches Tower III (333 metres long) for its final evaporation cycle. By the time the brine leaves this tower, it has a concentration of 30%. The processed brine is then pumped to a salt-brewing plant where salt and therapeutic lye are produced.
