KIEV, June 20 - Crimean Soda Plant in Krasnoperekopsk, part of OstChem Holding, which is under control of Dmytro Firtash, has completed the first stage of the plant's upgrade worth EUR3 million, by replacing two out of four filters at the plant.

"After the upgrade, the plant will start producing soda ash with low chlorine-ion content, which is in greater demand on the international market," reads a press release of OstChem issued on Thursday.