The salt-free alternative to water softeners

calmat® is an eco-friendly water treatment system for your home that protects your piping system and appliances against scale deposits and rust. The calmat®-Impulse-Technology is based on the principle of physical water treatment. Special electronic impulses change the crystallization process of the liquid calcium. This way the hard scale loses its adhesive power. The technology works exclusively with capacitive electric impulses: no use of any salt or chemicals.


blankThe eco-friendly solution against scale problems

blankNo use of salt or chemicals

blankDo-it-Yourself installation without cutting the pipes

blankWorks on every pipe material

blank5-year international warranty


calmat Made in Germany  Quality Made in Germany

Over 40 years experience in physical water treatment.
International 5-year warranty.
Tested by independent institutes.
cULus, TÜV Nord and CE certified.



For single family houses or small machinery.

Pipe diameter up to 11/2” (~ 38 mm)

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10 Reasons for calmat®

blankGerman 24 Volt Impulse-Technology (capacitive): The water is treated with electric impulses that control scale in an eco-friendly “green” way. It is an electric system that is not magnetic-based.

blankcalmat® works on a frequency range between 3-32 kHz with different frequency peaks (wobbling distribution). The secret to the right performance of physical water treatment lies in the composition of these impulses. CWT has developed and fine-tuned them for over 30 years.

blankcalmat® uses customized isolated copper impulse cables. The secret to a maximized performance is not only the impulse composition but it is also etermined by how that is transferred onto the pipe. The calmat impulse cables are specially manufactured and contain a high number of single individual copper cables inside. The more single cables, the more powerful the transfer.

blankcalmat® is designed with an isolated plastic frame. Unlike many other products where you face a black box that prevents you to understand what lies inside that product, calmat comes with a transparent top that allows to see what the product consists of.

blankcalmat® comes with external UL and TÜV-approved electronic switching adaptors. They operate with a very low power consumption of 100-240V and equalize possible power instabilty.

blankcalmat® is not magnetic-based. Therefore, it operates 100% independent of the velocity (water flow rate) in the pipe and constantly provides reliable impulses that guarantee the right output at all times.

blankMaterial-matching programs for different materials: calmat treats any pipe material. No need to buy a different product for metal, PVC, plastic etc. any more.

blankThe automatic memory program keeps calmat running correctly. In case of the unlikely event of a power failure calmat automatically resets back to the last program once power is regained.

blankcalmat® holds numerous certifications by renowned international institutions: the German TÜV, the German CE, the UL-approval for switching adaptors etc.

blank calmat® needs only little electric power as it is very economical. The units operate with 4.3 Watt. The running costs are appox. 7 USD (~6 EUR) per year.