| About 1830 | Several lime burners from the Eifel found a company and set up a ring kiln |
| 1934 | Peter Neuendorf from Pelm sets up a small shaft kiln |
| 1960 | Foundation of the Akdolit-Werke GmbH; set-up of a small manufacturing plant for water treatment and filtration products in Pelm |
| 1980 | Complete takeover by the Wülfrather group |
| 1990 | Pelmer Kalkwerk Neuendorf KG is taken over as a subsidiary by Akdolit-Werk GmbH |
| 1994 | Re-naming to Akdolit GmbH |
| 2000 | Re-naming to Rheinkalk Akdolit GmbH & Co. KG |
| 2010 | Merger with the sister companies Rheinkalk Messinghausen GmbH & Co KG and Rheinkalk Hagen-Halden GmbH & Co. KG. The company is now called Rheinkalk Eifel Sauerland GmbH & Co. KG branch Akdolit |
Akdolit® started its long history as a small company producing water treatment reagents for the implementation mainly in filters. Thereafter, Akdolit® grew into a force in the water treatment reagent industry and, after several business changes, become part of the Rheinkalk group, a subsidiary of Lhoist. Today, Akdolit® stands for Lhoist's global brand of water treatment reagents and solutions and encompasses much more than filter reagents. Please read below a brief history!