HYDRO-ELEKTRA deals in: -water and oil-in-water emulsion hydraulics (plunger pumps, hydraulic filters, hydraulic filters - dispensers, valves and fittings), -electrical engineering and electronics for Ex zones (mainly/principally for mining industry), -project and technical consulting and modernization of equipment for Ex zones, -obtaining required technical opinions, authorizations and inspection certificates of UE/EC-type (CE mark if required), -deliveries of pumps and stations for hydrostatic and hydrodynamic tests (e.g. hydrodynamic fatigue of hydraulic cylinders), -production and support for reverse filters and filters joinable for water and emulsions, -production and support of machines for widely meant underground construction business, -support of connection subsystems and monitoring and control subsystem, -project and technical advisory for mechanical upgrades.