Bacteria Control

Legionella is a bacterium that flourishes in pipes and tanks for potable water. And it may be found in all kinds of installations. Only its concentration is different. In only a few days the number of bacteria may grow to a distinctly hazardous level for the consumers of the installation. Maintenance, temperature and the structure of the installation may be crucial aspects for its growth.

The Legionella bacterium may cause the legionary disease, which is a serious form of pneumonia, often with a concomitant effect on other vital organs. The disease may cause death or invalidity. A quick doctor’s call is vital, as medicine against ordinary pneumonia has no effect.




The environmentally friendly LegioFree® ensures safe disinfection of Legionella in hot-water supply and air-conditioning systems.



LegioControl® integrated dosing and control system for prevention of Legionella.



Comprehensive service concept for bacteria prevention. Covering all needs from immediate assistance to long term prevention of Legionella.



The Guldager ALPHA B Valves are particularly designed and manufactured for the automatic balancing of heating and cooling circuits.



Guldager is a Danish family owned company. The company was founded in 1946 and is today a modern company, represented internationally through subsidiaries, agents and dealers. We apply decades of experience, up-to-date knowhow and cutting-edge technology to meet the many needs of our customers.


Guldager A/S is an international company committed to its customers. We are used to provide service and support to our customers all over the world. Please feel free to contact any member of the Guldager team, we are looking forward to hearing from you.

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GULDAGER A/S HEJREVANG 1-5 DK-3450 ALLERØD +45 48 13 44 00