I'll link Chemist's report for the history and calcium purification process as he covers it well:
Only after we had finished exploring did we set off some motion sensors somewhere on the perimeter of the building, whilst we were taking some externals.
The control room and obligatory industrial porn.
Conical thickeners, which could settle out the salt from the concentrate, which would then be sent downwards, filtered more and collected in storage tanks.
At the top floor, beside the only complete evaporator, where the process begins. Before this, the solution is pumped from the river to these evaporators.
Here you can find the documentary styled video on this location. The thumbnail might be confusing but the first 9 mins showcase this site. We cover the past, present and future of the plant through cinematics and narration: