|Open Doors: visitors explore the gallery|
A purification plant has been operating here since 1874. Steam pumps processing 10 million gallons of river water per day by means of reciprocating pumps and waterwheels, which were replaced (at the time of the 2nd World War) by centrifugal pumps and turbines.
|Simplified map of the watershed (Wikipedia)|
In order to clarify and cleanse the raw river water, it goes through a series of processes including the addition of sulphuric acid to remove the aluminium in it.
|Scum from "raw" water|