Kläranlage Hagen-Boele, Kalkdosierungseinrichtung, Kompressor, Druckkessel, Kalksilo 1, Mischbehälter für Kalkhydrat und Wasser, Regulierung der Kalkmischmenge in Verbindung mit Ph-Wert-Shreiber, Kalksilo 2 (v.l.n.r.)

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