Description
McAlpine Scale Defender
About this item
- PROTECTS AGAINST LIMESCALE – Prevents damaging mineral buildup in pipes and appliances to improve efficiency, extend lifespan and maintain clean water quality.
- EASY DIY INSTALLATION – Fits directly to your water supply line with no specialist plumbing skills required.
- LONG-LASTING PERFORMANCE – Replacement cartridge treats up to 40,000 litres of water and lasts up to six months depending on usage.
- COMPACT SPACE-SAVING DESIGN – Slim 115 mm x 75 mm x 210 mm unit is ideal for tight kitchen cupboards or small utility spaces.
- ECO-FRIENDLY OPERATION – Works without chemicals, salt or electricity for an environmentally responsible solution.
- DURABLE AND RELIABLE – Tested to 25 bar pressure with a working range of 0.5–10 bar to ensure safe, leak-free performance.
- COMPLETE STARTER PACK – Includes Scale Defender unit, replacement cartridge, 15 mm & 22 mm connectors and full instructions for quick, hassle-free installation.
Watch our animation above to see just how the Scale Defender protects your whole home.

Benefits for Plumbers
Takes less than 1hr to install. Once installed cartridges are easily replaced. You also get everything you need in one box, incl. brackets & reducers.

Scale Defender Saves £££
Limescale damage to your pipes, boilers, & appliances could cost you up to £200 extra per year in energy bills and repairs. Stop it before it builds.

Whole-House Protection
Scale Defender is fitted just after the internal mains stopcock so it can provide whole house protection against limescale.

Easy to Fit
It’s simple to fit – often within 45–60 mins by a plumber. Cartridges are easy to replace, and the system is free of ongoing maintenance.
| Connections | ¾” Male BSP with 15mm & 22mm fittings |
| Lifetime dosing cartridge | Up to 40,000 Litres |
| Temperature range | 1˚C – 40˚C |
| Working pressure | 0.5 – 10 Bar |
| Weight | 0.97kg |
| Pressure loss head max | ± 0.3 Bar |
| Test Pressure | 25 Bar |
| Lifetime prefilter | Easy Clean |
McAlpine Scale Defender Starter Kit

Chemical Free Protection
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 & is safe for human consumption, according to WHO / FAO recommendations. It’s also in accordance with the intl. norm for drinking water to the EC regulations, standard (EN 1212) & British Standard BS EN 1212.
Manufacturer reference : SCA-STA



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