07.07.2020 / 20:25




On the following pages we have compiled a brief selection of some of the most frequently-asked questions (FAQ).
If you cannot find your question, or if you have further questions, please do not hesitate to contact us.

01.    What is hard water?  

The water supplied by your local waterworks is clean drinking water in compliance with DIN 2000.
Depending on the source of the water, it will contain a greater or lesser amount of calcium. Hard water is water with a high calcium content. There are varying hardness ranges, which are measured in ° German hardness (°dH).

» Hardness range 1 = 0 – 7 °dH (soft water)
» Hardness range 2 = 8 – 14 °dH (ideal drinking water)
» Hardness range 3 = 15 – 21 °dH (hard water)
» Hardness range 4 = over 21 °dH (very hard water)

02.    Why does hard water contaminate our environment?

For hard or very hard water, up to 100 % more washing agents are required. This naturally contaminates the waste water. The same applies to shower gel, hair shampoo and soap. Aggressive cleaning agents are also required to remove calcium stains from tiles, bathroom fittings and ceramic sanitary equipment. In addition, more energy is consumed, since every millimetre of limescale deposit (calcium carbonate) means a 10% increase in the energy requirement (e.g. by the boiler).

03.    What is the solution to hard water?

The optimum solution is the use of a water softener using the ion exchange procedure or an alternative form of limescale protection (seed crystal formation).
Following prior consultation, these can be installed and optimally adjusted by your specialist installer in accordance with DVGW guidelines.
With a water softener using the ion exchange procedure, your water hardness is adjusted to the ideal range of approx. 8 °dH.

04.   What advantages does softened water offer?

» energy savings
» no more decalcification required
» no more blocked shower head
» up to 50 % savings on washing, cleaning and skin-care agents
» fewer calcium stains on tiles, bathroom fittings and ceramic sanitary equipment etc.
» Hygiene protection

05.    Are important minerals and trace elements lost by softening water?

In accordance with EC directives, water is adjusted to the ideal water hardness of approx. 8 °dH by the softening process. This therefore constitutes only partial softening of the water. This water still contains enough of the necessary minerals and trace elements, the overall mineral content of the water is not reduced.

06.    What sort of damage takes place in case of corrosion of water pipes?

The worst case is the rupture of the pipe, with associated high consequential damages and costs. Other unpleasant and equally costly consequences are valves and fittings blocked by rust particles and household appliances damaged by rust.

07.    How can I protect my household installations against corrosion?

The use of a protective filter is required by DIN 1988. The most effective protection against rust and corrosion damage is the formation of a protective layer on the inner surface of pipes by means of the mineral materials dosing.

08.    Are the "mineral materials" used for corrosion protection dosing chemicals?

The "mineral materials" used, such as phosphates, are found in many foodstuffs, and also in the human body.
These are needed as building materials during growth, and also for many other bodily functions. Phosphorous is an essential element for life, an important constituent of bones, is involved in the energy transmission during metabolism and is also essential for muscle and brain activity. According to German drinking water regulations and the EC directives of the World Health Organisation (WHO), a maximum of 5 mg of phosphates may be added per litre of drinking water.

09.    How accurately do DVGW-approved dosing devices work?

Modern precision devices must undergo strict testing before they are approved for installation into drinking water systems. The dosing quantities specified in German drinking water regulations (TAVO) must not be exceeded, and the minimum quantities must not fall below the levels specified in DIN 19635. The mineral materials added must be of a quality suitable for use in foodstuffs, and must comply with relevant foodstuffs regulations, the "TAVO" and the applicable EC directives. The DVGW test symbol on such devices, in conjunction with the relevant mineral materials, therefore guarantees you the optimum function and effect.

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