Rapid Soft

Scale Prevention for Residential and Commercial Buildings

A Different Approach - To understand both, first it is necessary to understand what RapidSoft does, what is its chemistry and how they differ from conventional watersoftners

Hardwater contains unusual characteristics of dissolved Calcium in the form of Calcium bicarbonate, known as temporary hardness  Ca(HCO₃)₂, as well as other dissolved salts.

Calcium bicarbonate has two unusual characteristics.

First, it is less soluble in hot water than cold. When Calcium bicarbonate comes out of the bracket it precipitates.


Ca(HCO3)2  =  CaCO3 + CO2 + H2O 

It converts to Calcium Carbonate and the byproducts are carbon dioxide (CO2) and water (H2O). In addition to increased temperature, precipitation also occurs due to a drop of pressure or an increase in pH, known as a scaling formation.

Second, unusual characteristic of Calcium bicarbonate  Ca(HCO₃)₂ is that when calcium carbonate starts to form or nucleate, it has to do so onto something else; called nucleation sites, it cannot precipitate on its own. Therefore, it sticks to surfaces as scale and causes problems in residential and commercial plumbing systems, including clogging pipes heater, causing wasted energy and other problems associated with hard water. Conventional water softener solutions based on ion exchange only focus on removing the Calcium (Ca2+) Ion from hard water and replacing it with Sodium or Potassium ions that do not stick to surfaces.

But what if there were an alternative technology that stopped the Calcium carbonate from sticking to surfaces?  

  • That would solve one of the biggest water problems assocoated with hard water. 
  • This is exactly what Nucleation Assisted Crystallization (NAC) softeners do.


Speaking about the revolution, they generate an “Nucleation seed” around the nucleation beds in the Rapidsoft system prior to the scaling event. So when the scale precipitates, it tends to do so on the nucleation seed instead of the surfaces it normally would.

The scale, rather than being stuck to a surface, is now held in suspension in the water as a fine powder. It will be carried away by the flow of the water as a very fine particle of Calcium carbonate, much like calcium dust found in milk. It might deposit on surfaces when the water evaporates, such as on shower screens and work tops, but it easily can be wiped away because it is not sticking to the surface. There is no need for chemical cleaning using Acids.

Once formed by precipitation in suspension, the scale is stable and will not revert to its dissolved state unless the pH is reduced. It will not react with soaps, reducing lathering and producing scum the same way that soap behaves in conventional soft water. The water contains the same amount of Calcium, but now it is in a solid form of Calcium Bicarbonate (Ca(HCO₃)₂), rather than the dissolved form, temporary hardness Calcium Carbonate.



In nucleation, molecules assemble into a tiny crystal on surfaces of Filtersorb SP3 beads that grows with rapid speed. Once the ordered nucleus formed, more molecules added to the crystals, growing the Calcium carbonate but not changing its structure. Crystals are directly formed from Calcium (Ca) and Carbonate dissolved in the hard water, the form called Amorphous Calcium Carbonate.