Description
The McAlpine Scale Defender Refill Pack contains 2 replacement polyphosphate cartridges for use with your existing McAlpine Scale Defender unit. Each cartridge treats up to 40,000 litres, providing continued limescale protection for your boiler, pipes, appliances, and entire home plumbing system.
What's Included
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2 x Replacement Cartridges - Food-grade polyphosphate dosing cartridges
- Each cartridge treats up to 40,000 litres
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Total capacity: 80,000 litres (both cartridges combined)
Why Replace Your Cartridge?
The polyphosphate cartridge is the active component that protects your home from limescale. As water passes through, the cartridge gradually dissolves, treating your water supply. When the cartridge is depleted, it needs replacing to maintain continuous limescale protection.
Signs your cartridge needs replacing:
- Cartridge appears significantly smaller or depleted
- Limescale starting to reappear on taps or appliances
- Approximately 40,000 litres of water has passed through (varies by household usage)
- Reduced water treatment effectiveness
Key Features
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2 cartridges included - Long-term supply for continued protection
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40,000 litres per cartridge - Extended treatment capacity
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Food-grade polyphosphate - Safe for drinking water (WHO & FAO approved)
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Easy DIY replacement - Simple screw-in installation, no plumber needed
- Compatible with all Scale Defender units
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Maintains system efficiency - Keeps your heating system running optimally
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Protects entire home - Boiler, pipes, radiators, taps, and appliances
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Saves money - Prevents costly limescale damage and reduces energy bills
Technical Specifications
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Brand: McAlpine
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Product Type: Scale Defender Replacement Cartridges
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Quantity: 2 cartridges
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Cartridge Capacity: Up to 40,000 litres each
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Total Capacity: 80,000 litres (both cartridges)
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Weight: 0.41kg (pack of 2)
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Material: Food-grade polyphosphate
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Standards: BS EN 1212, EC regulations EN 1212
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Compatibility: All McAlpine Scale Defender units
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SKU: K33101
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Safety: WHO & FAO approved for drinking water
How to Replace Your Cartridge
Replacing your Scale Defender cartridge is quick and easy:
- Turn off your water supply
- Unscrew the Scale Defender housing
- Remove the old cartridge
- Insert the new cartridge
- Screw the housing back together
- Turn the water supply back on
- Check for leaks
No plumber required - most homeowners can replace the cartridge themselves in just a few minutes.
Why Continue Using Scale Defender?
Limescale affects your pipework, boiler, radiators, taps, appliances, and fittings and can lead to increased repairs or early replacement costs. A 1mm layer of limescale in your boiler can amount to an extra £150 to £200 in household bills every year according to the Carbon Trust.
By maintaining your Scale Defender with regular cartridge replacements, you continue to:
- Reduce energy bills by maintaining boiler efficiency
- Extend the life of your boiler and heating system
- Protect washing machines, dishwashers, and other appliances
- Prevent costly limescale-related repairs
- Maintain better water flow and pressure
- Keep taps and fixtures looking cleaner
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 WHO and FAO recommendations and in accordance with international norms for drinking water to EC regulations, standard EN 1212 and British Standard BS EN 1212.
Perfect For
- Existing Scale Defender unit owners
- Replacing depleted cartridges
- Maintaining continuous limescale protection
- Hard water areas
- Homes with combination boilers
- Properties with expensive heating systems
- Landlords maintaining rental properties
- Long-term system maintenance
Note: This is a refill pack containing replacement cartridges only. The Scale Defender unit is required (sold separately as starter kit K33100).
