Pipe systems

Guldager’s Unicat protects the pipe system of the installation against rust. The Unicat plant consists of a treatment part, an electronic unit, and a pump.

Unicat is intended for systems with heat-exchangers or small tanks. It is an independent unit consisting of a treatment component and an advanced control unit. The treatment component is a small enamel coated tank with two electrodes, an  aluminium cathode and an anode consisting of titanium thread coated with mixed metal oxide and wound spirally round the cathode.
The electronic unit supplies current (low tension, D.C.) to the anode. As a result, the aluminium cathode is slowly dissolved as aluminate ions, which are lead into the pipe system.

Along with the metal oxides from the surface of the pipes, the aluminate ions form a protective layer in the entire pipe system. The protection layer prevents rust and corrosion in the pipes. The pump ensures a constant flow through the treatment unit and into the pipe system.


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