McAlpine Scale Defender Starter Kit | Limescale Protection | 40,000L

Description

Hard water costing you money? The McAlpine Scale Defender Starter Kit is the smart, compact alternative to a water softener — protecting your entire home from damaging limescale without salt, without ongoing maintenance, and without the bulk. Fitted once at the mains stopcock, it gets to work straight away, quietly shielding your boiler, pipes, radiators, taps, and appliances for up to 40,000 litres per cartridge.

What's Included

  • 1 × Scale Defender unit
  • 1 × Polyphosphate cartridge (40,000L capacity)
  • 15mm connectors
  • 22mm connectors

Key Features

  • Whole-home protection — fitted at the internal mains stopcock to treat all water entering the property
  • 40,000L cartridge capacity — long-lasting performance before a simple cartridge swap
  • Food-grade polyphosphate — WHO and FAO approved, safe for drinking water, BS EN 1212 certified
  • No salt, no regeneration cycles — far more compact and cheaper to run than a traditional water softener
  • Protects appliances and heating systems — a 1mm limescale build-up can add £150–£200 to your annual energy bills (Carbon Trust)
  • Easy cartridge replacement — no tools, no specialist knowledge required
  • 15mm and 22mm fittings included — compatible with standard UK pipework

Technical Specification

  • Brand: McAlpine
  • Model: Scale Defender Starter Kit
  • SKU: SCA-STA
  • Cartridge capacity: 40,000L per cartridge
  • Connections: 15mm and 22mm (included)
  • Active ingredient: Food-grade polyphosphate
  • Compliance: BS EN 1212 | EC drinking water regulations
  • Installation: Professional plumber recommended (45–60 mins)
  • Maintenance: Cartridge replacement only — no ongoing servicing
  • Weight: 0.97 kg
  • Country of Origin: United Kingdom

Frequently Asked Questions

  • How does polyphosphate protect against limescale?
    Polyphosphate coats calcite crystals in the incoming water, preventing them from bonding to surfaces. Your appliances stay scale-free, and calcium remains in the water so it's still safe and pleasant to drink.
  • Do I need a plumber to fit it?
    Yes — professional installation is recommended. Fitting takes 45–60 minutes and the unit is installed just after your internal mains stopcock. After that, cartridge replacements are a simple DIY job.
  • Where is it fitted?
    Just after the internal mains stopcock, so it treats all water entering the property and provides whole-home protection.
  • Why choose Scale Defender over a water softener?
    Much lower running costs, far more compact, and no need for salt top-ups or regeneration cycles.
  • Why is it better than a sacrificial zinc anode?
    Zinc anodes work well with constantly flowing water but fail with stored water — aragonite reforms into calcite over time, meaning limescale will gradually build up in your heating system and tanks. Scale Defender provides continuous protection regardless of flow patterns.
  • Is polyphosphate safe?
    Yes — it's a food-grade ingredient approved by the WHO and FAO, and widely used in food processing. It complies fully with BS EN 1212 and EC drinking water regulations.
  • Can I order if the item shows as out of stock?
    Yes — this item is ordered in specially for you and will typically be dispatched within 5–7 working days.
  • When will my order be dispatched?
    As this item is ordered in to fulfil your order, please allow 5–7 working days for dispatch.

Delivery Information

This is a small, postable item covered by a one-off small item delivery charge. You can combine it with other small items in a single order and pay just one delivery charge. Browse all items covered by the small delivery charge.

Recommended Accessory

Once your Scale Defender is installed, you'll need to replace the cartridge periodically to maintain full limescale protection. We recommend picking up a refill pack at the same time so you're always prepared:

 

McAlpine Scale Defender Starter Kit | Limescale Protection | 40,000L

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£4.99 Delivery

Hard water costing you money? The McAlpine Scale Defender Starter Kit is the smart, compact alternative to a water softener... Read more

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£329.00  £199.00

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    • Several items? ask for a bespoke price!
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    • FREE Collection from Norwich
    • No hassle returns, 30 days return

    Description

    Hard water costing you money? The McAlpine Scale Defender Starter Kit is the smart, compact alternative to a water softener — protecting your entire home from damaging limescale without salt, without ongoing maintenance, and without the bulk. Fitted once at the mains stopcock, it gets to work straight away, quietly shielding your boiler, pipes, radiators, taps, and appliances for up to 40,000 litres per cartridge.

    What's Included

    • 1 × Scale Defender unit
    • 1 × Polyphosphate cartridge (40,000L capacity)
    • 15mm connectors
    • 22mm connectors

    Key Features

    • Whole-home protection — fitted at the internal mains stopcock to treat all water entering the property
    • 40,000L cartridge capacity — long-lasting performance before a simple cartridge swap
    • Food-grade polyphosphate — WHO and FAO approved, safe for drinking water, BS EN 1212 certified
    • No salt, no regeneration cycles — far more compact and cheaper to run than a traditional water softener
    • Protects appliances and heating systems — a 1mm limescale build-up can add £150–£200 to your annual energy bills (Carbon Trust)
    • Easy cartridge replacement — no tools, no specialist knowledge required
    • 15mm and 22mm fittings included — compatible with standard UK pipework

    Technical Specification

    • Brand: McAlpine
    • Model: Scale Defender Starter Kit
    • SKU: SCA-STA
    • Cartridge capacity: 40,000L per cartridge
    • Connections: 15mm and 22mm (included)
    • Active ingredient: Food-grade polyphosphate
    • Compliance: BS EN 1212 | EC drinking water regulations
    • Installation: Professional plumber recommended (45–60 mins)
    • Maintenance: Cartridge replacement only — no ongoing servicing
    • Weight: 0.97 kg
    • Country of Origin: United Kingdom

    Frequently Asked Questions

    • How does polyphosphate protect against limescale?
      Polyphosphate coats calcite crystals in the incoming water, preventing them from bonding to surfaces. Your appliances stay scale-free, and calcium remains in the water so it's still safe and pleasant to drink.
    • Do I need a plumber to fit it?
      Yes — professional installation is recommended. Fitting takes 45–60 minutes and the unit is installed just after your internal mains stopcock. After that, cartridge replacements are a simple DIY job.
    • Where is it fitted?
      Just after the internal mains stopcock, so it treats all water entering the property and provides whole-home protection.
    • Why choose Scale Defender over a water softener?
      Much lower running costs, far more compact, and no need for salt top-ups or regeneration cycles.
    • Why is it better than a sacrificial zinc anode?
      Zinc anodes work well with constantly flowing water but fail with stored water — aragonite reforms into calcite over time, meaning limescale will gradually build up in your heating system and tanks. Scale Defender provides continuous protection regardless of flow patterns.
    • Is polyphosphate safe?
      Yes — it's a food-grade ingredient approved by the WHO and FAO, and widely used in food processing. It complies fully with BS EN 1212 and EC drinking water regulations.
    • Can I order if the item shows as out of stock?
      Yes — this item is ordered in specially for you and will typically be dispatched within 5–7 working days.
    • When will my order be dispatched?
      As this item is ordered in to fulfil your order, please allow 5–7 working days for dispatch.

    Delivery Information

    This is a small, postable item covered by a one-off small item delivery charge. You can combine it with other small items in a single order and pay just one delivery charge. Browse all items covered by the small delivery charge.

    Recommended Accessory

    Once your Scale Defender is installed, you'll need to replace the cartridge periodically to maintain full limescale protection. We recommend picking up a refill pack at the same time so you're always prepared:

     

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    Returns & Delivery

    When will my order be delivered?

    Your order will be packaged really carefully and delivered wherever you want. Delivery takes between 2-4 business days. Look out for emails from our delivery partners, You will receive an e-mail after ordering with more information about the delivery.

    Can I return my product?

    Orders can be returned or exchanged within 30 days of receiving the parcel, providing they are in original resalable condition.

    What can I do if my item (or part of it) is damaged?

    We work hard to deliver your items without damage. If anything arrives damaged on delivery just refuse the delivery, Any damages found after delivery must be reported with photographic evidence. Orders can be returned or exchanged within 30 days of receiving the delivery, providing they are in original resalable condition.

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