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Electronic anti-limestone GEMKA D

Anti-limestone device developed and manufactured in France R Cube Project.

No consumables or maintenance required
Treat your entire water system in a preventive and curative way.

Designed in an environmentally friendly way
Based on an International Patent - innovative rotating induction catalysis technology.

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959,40 € tax incl.

1 299,00 € tax incl.

-339,60 €

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What is the Gemka?

Anti calcaire électronique GEMKA D
GEMKA is an anti-scaling device developed and manufactured in France by the company R Cube Projet.

WITHOUT CONSUMPTION OR MAINTENANCE, this device allows you to treat your entire water network in a preventive and curative way.

ECOLOGICALLY DESIGNED, it is based on an International Patent and an innovative rotating induction catalysis technology. Its variable frequencies automatically adapt to the hardness of the water to be treated



GEMKA obtained the support and award from Oséo®, winner of the 1997 Lépine International® competition.

How does GEMKA work on limestone?
The GEMKA device forces the crystallization of limestone into a microscopic powder suspended in water. Once it has settled, this limestone can easily be removed from your sanitary facilities and surfaces. Thanks to GEMKA, you can finally control your limescale problems!

Operation of the electronic anti-limestone GEMKA D

Thanks to the suspension of the limestone in powder form, the limestone no longer clings to pipes and heating elements, but also to linen and skin, protecting me against scaling. In a second step, the powder induces a natural erosion phenomenon that dissolves the existing scale, gradually cleaning my installation



As the water passes through the treatment area, moving magnetic fields stimulate the water molecules.
This energy supply corresponding to the vaporization energy is equivalent to "heating the water cold" as the sun does on the sea surface when clouds form.


Being in a closed environment, unlike seawater, the stimulation of water molecules does not cause evaporation but the precipitation of limestone, or flocculation. Indeed, as with a rise in temperature, water molecules increase the amplitude of their vibration, weakening the solvation barriers that kept calcium and carbonate ions away from each other. Since they no longer have any constraints, the latter attract each other and form nanocrystals. This phenomenon then competes with scaling due to friction and the rise in temperature of the heating elements...




The presence of nanocrystals of limestone suspended in the water in turn causes limestone erosion. As water has become depleted of available calcium and carbonate ions, it begins to behave like rainwater: it seeks to be loaded with mineral salts. And to do this, it begins to dissolve the crystals created by Gemka®, but also the crystals already deposited in the form of tartar in the same way as it does when it gullies down the slopes of mountain ranges. This phenomenon lasts 100 hours (4 days) after its catalysis, the water has time to circulate throughout the network and to be evacuated by the waste water before recovering its scaling capacity.




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Pack contents and options to choose from

Water filter option

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Automatic self-cleaning filter

Automatic self-cleaning filter

148,80 €

Equipped with a pressure reducer and pressure gauge
Countercurrent washing without water shut-off.


  • filtration of solid impurities such as sand, rust, limescale, etc;
  • can be installed on vertical, horizontal or angled pipes
  • 1" and 3/4" universal connector (26/34 and 20/27)
  • system BACKWASH - simple reverse flush operation. Just one valve to open or automate!
  • rinsing water can be drained directly into the sewage system
  • system TWIST & CLEAN - cleaning the filter housing from the inside without having to turn off the water from the system

An upgradeable system
Optional: add the electronic box to automate backwashing

Backwashable domestic water filter

Backwashable domestic water filter

159,32 €

It is permanent and will not require cartridge changes.
Thanks to the quality of its filtration you will eliminate all impurities that could harm your installation.

Double water filter

Double water filter

56,25 €

Removing deposits from water
Bisphenol A free product, made in Europe

  • removes sludge and residues
  • improves taste
  • improves odour
  • better water quality
  • optimises the functioning of anti-limescale devices
  • limits pesticides, heavy metals...

Don't forget to order the appropriate 10" inch cartridges.

Carbon + Sediment Filter Pack

Carbon + Sediment Filter Pack

39,99 € Pack content

A cheap price for your activated carbon and sediment filter cartridges
You can store them and benefit from an advantageous price.

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