Water decalcification system - what to think about

The lime in tap water makes many homeowners worried. From which degree of hardness the lime load is really questionable, and which possibilities of water decalcification are available by plants, explained in detail this contribution.

for action

For soft and medium-hard water there is no need for action. Additional descaling can even have a negative impact on water quality.

Too soft water is aggressive, and in some cases can strongly attack metallic piping. Besides, it dissolves soap very badly.

Also the subjective feeling regarding taste and feeling of the water can deceive. In the run-up, you should first inform yourself at your own water supplier about the actual water hardness.

Descaling systems only make sense if the water hardness exceeds 14° dH. When hardening at or below these levels, you should refrain from buying a water softener.

Lime health hazard

Unfortunately, there is still the rumor that too much lime in the water is harmful to health and would trigger "calcification" in the body. That's not true, it's just a fairy tale. Calcium and magnesium ions are important elements for our body, they do not need to be removed for health reasons.

And "calcification" in arteries, coronary vessels and in the brain is not caused by lime, but by other substances. Only the appearance resembles a calcified water pipe, that's why the term has been coined.

Types of descaling systems

For private use, only ion exchanger systems are suitable. They consist of an exchange resin, which is charged via a NaCl solution with sodium ions.

If lime-containing water flows past, the calcium and magnesium ions are held in the exchange resin and the stored sodium is released into the water.

If all sodium is consumed in the exchange resin, it must be regenerated by a NaCl solution. As a result, the filtered-out calcium and magnesium ions are simultaneously rinsed out of the exchange resin and discharged into the wastewater. Such descalers are also permanently installed in every dishwasher.

Dual-chamber systems work in parallel - one tank is regenerated, while the other provides lime-free water. For private households this is recommended.

wonder gadgets

"Magic devices" for the physical decalcification of the water, which are to work with magnets or electricity, work on the basis of a mere theory. They bring no measurable performance. As long as they do not have a DVGW approval mark, they should not actually be installed or grown.

Tips & Tricks

Particularly affected by high water hardness are boilers, washing machines and coffee machines and water heaters - so only devices in which water is heated. For the washing machine alone, a decalcification system is not worthwhile. It can also be operated with rainwater, and each detergent contains a large amount of chemical-based water softeners.