With the invention of Electrolysis, corrosion protection has been Guldager’s core business for many years.

Using different techniques depending on the installation, we possess a comprehensive experience in protecting boilers, storage tanks and pipe systems against corrosion.

By using the latest technology, our high-quality products are supported by our wide range of service maintenance. With this approach, we can guarantee the quality and value of your system for many years.

Products for corrosion protection

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Katolysis is effective in protecting against corrosion in hot water boilers and pipes.


Unicat is for systems with heat-exchangers or small tanks and protects the pipes against corrosion.


UniControl offers monitoring and supervision of your corrosion protection installation.

Cathodic protection

Cathodic protection against corrosion in steel filter vessels. Combine it with Unicat® and UniControl

Any questions? We are ready with advice and guidance.

Call +45 48 13 44 00  Monday – Thursdag 8-16 and Friday 8-15.30 and get answers to your questions about your installation, products, prices, contracts, etc. Our service center is also in contact with our service cars if you require emergency service.