The roots of EPSE treatment go back to a Pirkanmaa-based pickling company in the early 2000s. At the time, Vesa Rissanen, the inventor of the EPSE method, owned a pickling company which did hard chrome plating for airplane parts. The process involved the dissolution of numerous metals in an acid which ultimately became hazardous waste. Together with a friend, who was also an entrepreneur, Rissanen began to think about how to get rid of the heavy expenses and finally, following numerous tests, he managed to precipitate the acid in such a way that the end result consisted of clean water and a multimetal precipitate. But then the airplane factory closed, and the chrome plating business came to an end. For years, the precipitation formulae remained in a desk drawer.

After some ten years two other entrepreneurs heard about the precipitation formulae. and in cooperation with Rissanen they began to plan and implement the commercialization of the method. Initially, the company focused only on wastewater generated in pickling and the scale of the operations was small. At the same time, however, the problems created by mining wastewaters became the target of a lot of negative publicity in Finland and the trio began to wonder whether metals could also be separated from the wastewaters of mining operations. For this purpose, Global EcoProcess Services, or EPSE, was established in 2012. The company patented its method and its commercialization accelerated once it had been successfully tested on the wastewaters of the Talvivaara mine. After this, EPSE has tested its method in a wide range of applications and managed to achieve excellent results in each application area.

From the beginning of 2020, EPSE changed its name to EPSE Oy (Ltd.)