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Hard water treatment - prevention lime scale


  Calcium carbonate (CaCO3) or commonly also called lime scale or just hard water, occurs in dissolved form in virtually all types of water. Depending on region and origin of the water, there is very soft water with virtually no calcium carbonate through to very hard water with hardness values up to over 100 °dH(German Hardness*).
This calcium carbonate is precipitated, dependent on hardness and temperature, and is deposited in pipes, machines and on surfaces. Over the course of time, such deposits may build up more and more, thus leading to pipe blockages, machine malfunctions and thick scale encrustations which greatly impair heat transfer for instance. 1 mm of scale on a heat transfer surface is reducing the heat transfer app. by 14% compared to a clean surface without any scale.
The picture to the left shows a pipe full of scale formed by Calcium Carbonate and other salts solved in the water.
* 1° dH = 10mg/litre CaO or 17,85 mg/litre CaCO

The Pursanova TM are lessening such problems with hard water dramatic. It is proofed in 1000nds of machines, the calcium carbonate or other soluble salts, are kept solved in the water, and there is far less or no forming of scale on the inner surfaces. This is true for applications in drinking water and also in industrial applications.

Nowadays Pursanova TM is even treating lime slurry plants, which are used by water suppliers to stabilize the pH-value of drinking water. Or there are applications, where waste water is concentrated up to concentrations of well above 100,000 TDS without forming any scale in the heat exchangers used in the system.