McAlpine Scale Defender Starter Kit
The McAlpine Scale Defender Starter Kit includes Scale Defender unit, cartridge and 15mm and 22mm connectors.
McAlpine Scale Defender can save hundreds of pounds as it keeps your heating system more efficient and helps prolong the life of pipes, fittings and appliances.

Tackles Limescale. Protects your home and your pocket.
Limescale affects your pipework, boiler, radiators, taps, appliances and fittings and can lead to increased repairs or early replacement costs.
Did you know?
A 1mm layer of limescale in your boiler can amount to an extra £150 to £200 in household bills every year. (Figures from the Carbon Trust)

Easy to Fit
McAlpine Scale Defender should be fitted by a plumber, but at between 45–60 mins to fit it should only be an hours call out. Thereafter, it is easy to replace the cartridges, and the system requires no ongoing maintenance.

What is Polyphosphate?
Polyphosphate is a food-grade (consumable) product approved by the World Health Organization and Food and Agricultural Organization. It is widely used today in the food processing industry for cheese, meat, wine and other products.
McAlpine Scale Defender technology is a completely safe way to treat water in the home and is safe for human consumption according to the WHO and FAO recommendations and in accordance with the international norm for drinking water to the EC regulations, standard (EN 1212) and British Standard BS EN 1212.

Scale Defender can protect your whole house
Watch our animation on how Scale Defender protects your whole home.
Details
Frequently Asked Questions
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How does polyphosphate protect against limescale?
Polyphosphate coats calcite in the incoming water. This coating means it won’t stick to anything, so appliances will be free of limescale, but calcium will still be left in the water, so it's good to drink! -
I've got real limescale problems in my home. Do I need a plumber to fit your Scale Defender?
Scale Defender should be fitted by a plumber, but it should only take between 45–60 mins. It's an easy and quick process for a plumber, and after installation, replacing the cartridges is straightforward with no ongoing maintenance required. -
Where is Scale Defender fitted?
Scale Defender is fitted just after the internal mains stopcock so it can provide whole house protection against limescale. -
Why choose Scale Defender over a water softener?
The yearly running costs of Scale Defender are much lower than that of a water softener, and it’s much more compact! -
Why choose Scale Defender over any inline sacrificial zinc anode?
Sacrificial zinc anodes are great at constant flowing water, however, with stored water aragonite will reform back into calcite, over time this will result in limescale in your heating system and storage tanks. It’s like keeping a tyre topped up with air, without maintenance, the system will eventually fail. -
What is Polyphosphate and are there any health risks?
No, this is food-grade polyphosphate, and is WHO approved.