Limescale is the hard, off-white, chalky deposit that forms when calcium and magnesium minerals in water precipitate out of solution. It accumulates on surfaces in contact with hot or evaporating water - inside pipework, on heating elements, across heat exchanger surfaces, and around taps and outlets. In a domestic kettle it is an annoyance. In a commercial building it is a serious operational, financial, and regulatory problem.
Hydrotec provides scale control solutions for commercial and industrial buildings across the world - working with M&E consultants and contractors, facilities managers, building owners, and site operators to specify, install, and maintain the right solution for the water supply and the system in question.
Scale formation is costly, dangerous, and progressive.
The financial impact of limescale begins well before a system fails. A layer of scale just 1mm thick on a heating element reduces its thermal efficiency by 7-8% - meaning more energy is consumed to achieve the same output. As scale builds, fuel consumption rises, CO₂ emissions increase, and maintenance costs escalate. Left unaddressed, scale will block pipework, foul water heaters, and eventually render components unserviceable. At that stage the only solution is often to cut out and replace pipe sections entirely - a far more disruptive and costly intervention than prevention would have been.
Scale also creates a biological risk. Limescale deposits provide a habitat and a protective layer for dangerous bacteria, including Legionella pneumophila - the organism responsible for Legionnaire's disease. A scaled system is significantly harder to disinfect effectively, because scale shields bacteria from both thermal and chemical treatment. Controlling scale and controlling bacteria are therefore closely linked obligations, not separate ones.
Scale control is a legal and regulatory requirement in many buildings.
The Health and Safety Executive's Approved Code of Practice L8 and the accompanying technical guidance HSG 274 set out the requirements for Legionella risk management in water systems, including the control of scale as a contributing factor to bacterial risk. Building Regulations require the implementation of scale control measures on new and refurbished systems where water hardness exceeds 200ppm. BS 8558 provides additional guidance on the design of water supply systems, including scale control measures appropriate to the water hardness of the supply. Taken together, these create a clear expectation that scale risk is actively assessed and managed in commercial buildings - particularly those with complex or high-risk water systems.
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Water Treatment for Decarbonisation - Mitigating Limescale's Environmental Impact
Read NowOur Solutions
Physical Water Conditioning
Physical conditioning modifies the structure of hardness minerals so that they remain in suspension and pass through the system without adhering to surfaces. No chemicals are added, which means the water's potability is unaffected and there is no ongoing chemical cost or handling requirement. Physical conditioning is particularly well-suited to non-evaporative systems such as closed circuit heating and chilled water circuits, where the same water circulates continuously.
- No chemicals - lower maintenance burden and no effect on potability
- Effective for non-evaporative closed circuit applications
- Simple installation with minimal ongoing intervention
- Available in magnetic and turbulent flow formats to suit different pipe sizes and flow rates
Water Softening
Ion exchange water softening chemically removes hardness minerals from the water entirely, replacing calcium and magnesium ions with sodium. The result is genuinely soft water - with no hardness remaining to precipitate as scale. Softening is the appropriate solution where evaporative processes are involved, such as calorifiers, cooling towers, commercial kitchens, and laundry operations, or wherever a higher standard of scale elimination is required.
- Permanently removes all hardness from the supply
- Essential for evaporative applications - calorifiers, cooling towers, kitchens, laundry
- Makes water feel more luxurious - beneficial for hotel and hospitality applications
- Improves soap and detergent efficiency - important for commercial kitchens and laundry
Our Products
Physical Water Conditioning
HY-MAG®
Water conditioning. Like a softener, without the chemicals.
See MoreTurboMAG®
Water conditioning, turbocharged.
See MoreWater Softening
HydroION®
The sustainable water softener.
See MoreOur Offering
We assess the water hardness of the supply, the nature of the system, and the regulatory context before recommending a solution - ensuring the right technology is matched to the application. We provide free-of-charge water hardness analysis via our in-house laboratory, and our engineers carry out site surveys and produce technical drawings as part of the design process.
- Free-of-charge water hardness analysis via our in-house laboratory
- Site survey and system design
- Technical drawings and project documentation
- Supply, installation, and commissioning
- Ongoing maintenance contracts
