RWE uses Siemens controllers. However they do not have a phycologist on staff to put in the right parameter for the controllers.
In addition RWE its self could not get the algae concentration beyond 2g/l. Put that in perspective the current design is running the system between 25g/l to 50g/l.
Once again. Mr. Fisher do not have any technical staff to do this right. He fired all the technical staff because he is stupid.