Calcite and aragonite: two faces of calcium carbonate
Calcium carbonate (CaCO₃) is the compound responsible for limescale in water. What many people don't know is that it exists in two crystalline forms — called polymorphs — with radically opposite behaviors: calcite and aragonite.
Calcite is the thermodynamically stable form of CaCO₃. It crystallizes in the trigonal system as compact, strongly adherent blocks. It's what builds up on your pipe walls, in your water heater, on your heating elements — this is limescale in the proper sense.
Aragonite, on the other hand, is a metastable polymorph with an orthorhombic structure. It forms acicular (needle-shaped) crystals approximately 30 to 40 times smaller than calcite aggregates. These micro-crystals don't adhere to surfaces: they remain suspended in the water and are naturally carried away by the flow.
Why this difference is crucial for your installation
When hard water (rich in calcium and magnesium) circulates through your pipes, CaCO₃ will inevitably precipitate. The question is not whether limescale will form, but in what form.
Without treatment, calcite dominates. It forms a continuous layer of scale that:
- Reduces pipe diameter (potentially blocking them entirely)
- Creates an insulating layer on heating elements (+1 mm = +7% energy consumption)
- Promotes under-deposit corrosion
- Reduces the lifespan of your equipment (water heater, appliances, boiler)
With treatment that directs crystallization toward aragonite, these problems disappear: micro-crystals flow freely, no deposits form, and existing deposits gradually dissolve.
Electromagnetic treatment: how does it work?
LIMPEO, manufactured by JAEGER SAS, uses electromagnetic waves at specific frequencies to influence the nucleation phase of calcium carbonate.
Specifically, the electromagnetic field modifies crystallization conditions in the water by acting on calcium ions (Ca²⁺) and carbonate ions (CO₃²⁻). Instead of assembling into a trigonal structure (calcite), they organize into an orthorhombic structure (aragonite).
This mechanism has been scientifically validated by several university studies:
- Coey & Cass (2000) — Trinity College Dublin: demonstrated the impact of magnetic fields on CaCO₃ crystallization and scale formation. View study
- Kobe et al. (2001) — Jozef Stefan Institute, Slovenia: XRD/SEM analyses showing significant increase in aragonite fraction under magnetic field. View study
- Amiri & Dadkhah (2004) — Journal of Alloys and Compounds: evolution of CaCO₃ phases and modified scaling behavior. View study
- Beshchasna et al. (2020) — University of Nebraska: water heater trials showing significant reduction in CaCO₃ deposits. View study
Calcite vs aragonite: technical comparison
| Property | Calcite | Aragonite |
|---|---|---|
| Crystal structure | Trigonal | Orthorhombic |
| Crystal shape | Massive, compact blocks | Needles (acicular) |
| Characteristic size | Large (reference ×1) | 30 to 40× smaller |
| Wall adhesion | Strong — forms limescale | Weak — stays in suspension |
| Thermodynamic stability | Stable | Metastable |
| Practical consequence | Scaling, efficiency loss | No deposits, protected water |
Curative action: dissolving existing deposits
Electromagnetic treatment doesn't just prevent new deposits. In water containing dissolved CO₂, the calco-carbonic equilibrium enables a dissolution reaction:
CaCO₃ (s) + CO₂ (aq) + H₂O (l) ⇌ Ca(HCO₃)₂ (aq)
Solid calcium carbonate (limescale) is converted into calcium bicarbonate Ca(HCO₃)₂, a highly soluble species. Existing deposits gradually dissolve as water circulates. Within a few weeks to months, pipes return to their original condition.
88% scale reduction: the key figures
- 88% reduction in pipe limescale
- 25% savings on energy bills (removal of insulating limescale layer)
- Zero chemicals, zero salt, zero pollutant discharge
- Zero maintenance — no consumables, no intervention
- 10-year minimum lifespan
- Installation in 10 minutes with no water interruption
FAQ — Calcite vs Aragonite
What is the difference between calcite and aragonite?
Calcite and aragonite are two polymorphs of calcium carbonate (CaCO₃). Calcite has a trigonal structure and forms massive crystals that adhere to pipe walls (limescale). Aragonite has an orthorhombic structure and forms micro-needles 30 to 40 times smaller that remain suspended in water without creating deposits.
How does electromagnetic treatment transform calcite into aragonite?
LIMPEO emits electromagnetic waves at specific frequencies that modify the nucleation phase of calcium carbonate. Instead of crystallizing as calcite (adherent), CaCO₃ is directed toward crystallization as aragonite (non-adherent). This phenomenon has been confirmed by studies from Coey & Cass (2000) at Trinity College Dublin and Kobe et al. (2001) at the Jozef Stefan Institute.
Does existing limescale disappear with treatment?
Yes. The calco-carbonic equilibrium allows the conversion of solid calcium carbonate into calcium bicarbonate Ca(HCO₃)₂, a soluble form. Existing deposits gradually dissolve over a few weeks to months depending on scale thickness.
Does LIMPEO use any chemicals?
No. LIMPEO works solely through electromagnetic waves. It uses no salt, no chemicals, and produces no waste. It's a 100% ecological solution that doesn't alter the mineral composition of water.
How long does it take to see results?
The preventive effect is immediate: as soon as installed, new calcite deposits stop forming. The curative effect (dissolution of existing deposits) typically takes 2 to 8 weeks depending on the thickness and age of the limescale.
Is electromagnetic treatment scientifically proven?
Yes. Several studies published in peer-reviewed scientific journals confirm its effectiveness: Coey & Cass (Trinity College Dublin, 2000), Kobe et al. (Jozef Stefan Institute, 2001), Amiri & Dadkhah (Journal of Alloys and Compounds, 2004), and Beshchasna et al. (University of Nebraska, 2020).
Discover our scientific validation page for full study access, or explore how LIMPEO works in detail. Ready to protect your installation? Browse our product range.