REKUM Company from Mavrovo is maintaining the dry chambers and furnaces to:
1. Macedonia
- Skopje: Technical control - Zelezara, TMF, Rubin-Karmin, MZT-Learnica, Primeks, Zhitoluks, MZT-Energy and others.
- Ohrid: Sideros, PLN, Ezerka, AMAK, EMO and others.
- Gostivar: KEM, MI-Mak, Sarchem, Tulana, Ladilnik and more.
- Strumica: Nonmetals-Ograzden, Sanitarna Keramika, etc. Agrometal. etc.
2. Bulgaria
- Aurbus-Pirdop, Asarel-Panagyurishte, Bitaldent Sofia and others.
3. Kosovo
- Sarchem Cementara, Silkapor-Kacanik, Nevlepenec-Kacanik, ferronickel-Glogovac, KEK-Obilic and others.
TEC Oslomej REK Bitola and SILMAK - Jugohrom.
Laboratory equipment for TPP Oslomej, Vardar Dolomite, Silmak, Vitaminka, Drago and others.