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About The Company

Weldon Engineers India is a Delhi based company with over 15 years experience manufacturing and supplying successful non-chemical water treatment devices around the world. Scale-off is leading scale prevention range designed for use in industrial applications catering for equipment pr otection to large pipe-line scale prevention.

All Scale-off Device is certified and approved by many Govt. authorities. Scale-off operates totally non-chemically, does not add anything to the water and is even approved safe for use in drinking water systems. Scale-off requires no power, no maintenance and can be installed in remote locations, in gravity feed systems and will constantly treat water without the need for backwashing. Scale-off Device is widely used around the world offering a range of non-chemical treatment to industries like Steel Plant, Power Plants, Cold Storage, Sugar Industries, HVAC and many more.

Water is a very good solvent for minerals and many other materials. All of the ionic species try to keep in a thermodynamic equilibrium with their environment, and they achieve this by combining together in clusters - perhaps growing to form crystals - or by breaking up into free ions. All of these reactions are occurring all the time as local conditions change.


Forming part of the ions calcium and carbonate, and they can form calcium carbonate - the principle scaling salt found in hard waters. We need to understand the equilibrium of these species in water, and in doing so we will know whether scaling can occur, or not. If we can, in some way, change the equilibrium with ScaleOff , we can modify the scaling behavior of hard water.

The equilibrium solubility product for calcium carbonate is a thermodynamically defined value for a given pressure and temperature. It is the concentrations of calcium and carbonate free ions in equilibrium with a large crystal of calcium carbonate suspended in water. Equation (1) is the standard way of showing this equilibrium. It is this equilibrium point that all waters will try and reach either by crystal growth or dissolution. At this equilibrium point, the crystal will be growing and dissolving at the same rate.

Most waters will be at equilibrium if given time, but changes in the environment, such as bore-well water emerging to the surface or the temperature and pressure changes that take place in heat-exchange plants will disturb this equilibrium. This leads to changes of the water composition. If the concentration of calcium and carbonate is greater than the equilibrium requirements, then the water attempts to reduce these concentrations and it does this by precipitation and growth of scale crystals. Equally, the water may be under saturated with respect to calcium carbonate, and this will increase the free ion concentrations by dissolving scale crystals. The square brackets refer to the ion concentrations (mole/litre) of the free calcium and free carbonate, the 'a' refers to actual concentrations prevalent in the water, and 'eqm' to the equilibrium concentrations as defined above.

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