Hotline +49 (0)5663 9389 400 (Mo-Fr 10am - 17pm)

Anti limescale and Decalcification options for hard water

Lime-based or "hard water" makes work and can be expensive. Lime stains and deposits make cleaning in the kitchen and bathroom difficult. Over time, stubborn limescale forms in the dishwasher, in the washing machine, in the kettle, the coffee machine and invisible also in lines. If you do not descale regularly, household appliances often need to be replaced prematurely or expensive repairs are required. If the water is very hard, tea, coffee or water-based foods will not taste good either. Descaling the water or binding the lime naturally in the water therefore makes sense in many ways. We explain what options are available and what are the other benefits of soft water.

Three ways to handle lime

Natural limescale protection by seed crystals with the AquaKalko® System

How it works: The hardeners in the drinking water are bound to seed crystals, which are released into the water by friction of tiny AquaKalko® granulate beads. Lime can no longer be deposited in pipes and equipment or on surfaces, but remains in the body of water. 

The AquaKalko® granules are located (see all Products): 

  • in cartridges for the house & well water or
  • the limescale protection at the tapping point for drinking and cooking water or
  • in small bags for limescale protection in the washing machine or the kettle.

The granules themselves are made of lime. So it is completely natural and harmless to humans and the environment, because the water remains chemically unchanged.

Descaling by ion exchange

How it works: Small synthetic resin balls bind calcium ions out of the water and exchange them for sodium ions.
The water is decalcified and "soft". For example, coffee and tea taste much better. For top and bottom table filters, the performance of the resin granules is eventually exhausted and it must be replaced (in the descaling cartridge), or the filter cartridge must be replaced (in the AA inline system). With the Delfin domestic water softening system, the protective effect of the decalcified water extends to all pipes and appliances in the house and of course the water for drinking and cooking. The ion exchange resin in the parallel working "Dolphin" is regenerated with dilute brine, freed from the hardness components and disinfected. The regeneration solution is then completely flushed out of the system.

Decalcification by reverse osmosis

This is how it works: The ultrafine membrane in the reverse osmosis system also filters out minerals in addition to bacteria, viruses, drug residues or heavy metals. Thus, calcium and magnesium are removed, which are as hardeners in the drinking water. The reverse osmosis water tastes particularly soft. Connoisseurs recommend it for health reasons and because it is so well suited for coffee or tea.
Reverse osmosis systems are installed at the tap point of the drinking water in the kitchen. Domestic water pipes, fittings or household appliances can therefore not be protected by the water which has been decalcified.

Limescale protection or decalcification - what's better?

In this case, neither of the two variants is better or worse. What's right is what meets your personal needs: 

When limescale protection, the water remains chemically unchanged. Only the crystalline composition changes. This causes the taste of the water to remain unchanged. At the same time, however, the detrimental effects of hardness agents are eliminated because they are tightly bound to the seed crystals and can not bond to other surfaces. 

The seed crystals with the bound hardness formers float freely in the body of water. Therefore, they can also be visible - for example, on the bottom of the kettle. What initially looks like a conventional calcification, but turns out to be loose Auflagerung that can be easily wiped off or rinsed off. Devices, fittings or pipes no longer calcify. 

Limescale protection is the right thing if you want to protect your devices, fittings and pipes in the house, but do not want to change the taste of the water z. B. for coffee or tea sets. Because the technology behind the natural lime protection is less expensive, it is also cheaper to purchase than a decalcification system.

During decalcification by ion exchange hardeners are removed from the water. The water therefore changes in its taste. With the "dolphin" the hardness of the water is adjustable and thus the hardeners are not completely removed. Thus, you enjoy the benefits of low-lime water, without it can be corrosive to metals, glass and concrete by completely missing silicates in the water. 

Descaling systems are proven systems with reliable technology that protect the entire house from the negative effects of a lot of limescale in the water. The maintenance effort is limited to the replenishment of salt tablets and the occasional inspection of the plant display. The acquisition costs outweigh in the long term the benefits that result from the decalcified water.

Benefits of soft water beyond protecting equipment and wiring

  • better taste especially of tea and coffee (with decalcified water)
  • less (sharp) cleaning and rinsing agents are needed and the total amount of cleaning agent needed can be reduced
  • the cleaning of faucets, sink, shower, bath, toilet and glass and smooth surfaces is easier
  • detergent can be reduced; on fabric softener can be omitted
  • white laundry stays white (no gray haze), colorful laundry stays fresh for longer
  • you need less soap, shower gel or shampoo for body care the skin and hair are softer when cared for with soft water
  • indoor plants grow better with lime-poor water


The content of calcium and magnesium in drinking water, which determine the lime content in drinking water as a hardness factor, varies from region to region. Especially in areas with calcareous rock strata, water suppliers supply hard water. Devices for limescale protection in-house or Decalcification systems protect against the negative effects of lime on pipes, appliances, fittings and the taste of water. For soft water, there are various options in-house, where comprehensive lime protection can only emanate from installed equipment at the house water connection. The long-term cost of lime damage in the house justifies the cost of purchasing and maintaining lime treatment facilities in areas with medium to very hard water.

Please enter these characters in the following text field.

The fields marked with * are required.

I have read the data protection information.