---
product_id: 49101840
title: "Calmag SI-Calmag Scale Inhibitor"
brand: "calmag"
price: "R928"
currency: ZAR
in_stock: true
reviews_count: 9
category: "Calmag"
url: https://www.desertcart.co.za/products/49101840-calmag-si-calmag-scale-inhibitor
store_origin: ZA
region: South Africa
---

# Whole house scale protection 15mm compression fittings Lifetime guarantee Calmag SI-Calmag Scale Inhibitor

**Brand:** calmag
**Price:** R928
**Availability:** ✅ In Stock

## Summary

> 🛠️ Scale-free living, guaranteed – protect your home effortlessly!

## Quick Answers

- **What is this?** Calmag SI-Calmag Scale Inhibitor by calmag
- **How much does it cost?** R928 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/49101840-calmag-si-calmag-scale-inhibitor)

## Best For

- calmag enthusiasts

## Why This Product

- Trusted calmag brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Backed by a lifetime guarantee for peace of mind and long-term savings.
- • **Chemical-Free Solution:** Magnetic technology suspends scale without harsh chemicals or maintenance.
- • **Effortless Installation:** Fits seamlessly with standard 15mm compression fittings for quick setup.
- • **Boiler & Appliance Savior:** Keeps boilers and showers clog-free, enhancing efficiency and lifespan.
- • **Comprehensive Home Defense:** Protects your entire plumbing system from damaging limescale buildup.

## Overview

The Calmag SI-Calmag Scale Inhibitor is a WRAS-approved magnetic device designed to prevent limescale buildup across your entire home plumbing system. Featuring easy-to-install 15mm compression fittings and a lifetime guarantee, it offers a chemical-free, maintenance-free solution that protects boilers, showers, and pipes by keeping scale suspended in water rather than allowing it to adhere. Ideal for professionals seeking reliable, long-term water system protection.

## Description

Product Description The CalMag Magnetic Scale Inhibitor is suitable for installation on cold water lines for the prevention of limescale formation. The unit is supplied with 15mm compression fittings and can also be adapted for use with pushfit fittings. Box Contains 1 x Calmag 15 mm

Review: Appears to work. - I previously had a budget chemical limescale filter (still much more expensive than this item) which eventually was left for too long and clogged up, and so did the pipe connecting the filter and the electric shower. I was highly skeptical about the mechanism behind the magnetic limescale protection. Supposedly, the limescale is not removed but stays suspended in water, so it just does not stick to the pipes. However, I decided to buy this anyway as it fitted the gap left by the filter and was quite cheap. Few months on, the electric shower seems fine and even the shower head does not clog up as much.
Review: Good Product - Bought this item as a replacement for one which didn't appear to be working.Very easy to fit. Extremely good price compared to others. Can't comment on whether it's doing a good job as the results are not visually apparent. Only time will tell and I must say this applies to all brands.

## Features

- WRAS Approved Product
- 15 mm compression fittings
- Whole House Protection
- Lifetime Guarantee
- Protects Boiler

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000U1RZP2 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 81,369 in DIY & Tools ( See Top 100 in DIY & Tools ) 736 in Central Heating System Accessories |
| Customer Reviews | 4.4 4.4 out of 5 stars (234) |
| Date First Available | 2 Mar. 2010 |
| Item Package Quantity | 1 |
| Item Weight | 320 g |
| Item model number | SI-Calmag |
| Manufacturer | Calmag |
| Number of Pieces | 1 |
| Part Number | SI-Calmag |
| Product Dimensions | 1 x 1 x 1 cm; 320 g |

## Images

![Calmag SI-Calmag Scale Inhibitor - Image 1](https://m.media-amazon.com/images/I/51E9dF2DtUL.jpg)
![Calmag SI-Calmag Scale Inhibitor - Image 2](https://m.media-amazon.com/images/I/51TjKvxwnwL.jpg)
![Calmag SI-Calmag Scale Inhibitor - Image 3](https://m.media-amazon.com/images/I/41tXnSn-ukL.jpg)

## Questions & Answers

**Q: Can these compression fittings be used directly on pex piping?**
A: Yes, just use a pipe inserts.

**Q: I filter and drink the tap water. Does it change the taste?**
A: There is a slight change for the better I have found

**Q: How long does this product last before replacing**
A: I have mine in a couple of years and still seems to be working fine

**Q: Does this work please? I have seen so many mixed reviews for other similar products.**
A: Yes it works but people need to read instructions and carry out annual maintenance, ie.replacing as per instructions!!!
Any scale reducer will reduce any scale from causing damage to appliances relying on water!!
As a plumber/boiler technician I believe that we should all have a type of scale reducer on the mains on the mains entering the building,so it covers most or all water units/appliances…..!!!!!!

## Customer Reviews

### ⭐⭐⭐⭐⭐ Appears to work.
*by E***E on 15 March 2017*

I previously had a budget chemical limescale filter (still much more expensive than this item) which eventually was left for too long and clogged up, and so did the pipe connecting the filter and the electric shower. I was highly skeptical about the mechanism behind the magnetic limescale protection. Supposedly, the limescale is not removed but stays suspended in water, so it just does not stick to the pipes. However, I decided to buy this anyway as it fitted the gap left by the filter and was quite cheap. Few months on, the electric shower seems fine and even the shower head does not clog up as much.

### ⭐⭐⭐⭐ Good Product
*by J***D on 30 September 2012*

Bought this item as a replacement for one which didn't appear to be working.Very easy to fit. Extremely good price compared to others. Can't comment on whether it's doing a good job as the results are not visually apparent. Only time will tell and I must say this applies to all brands.

### ⭐⭐⭐⭐⭐ Easy to fit
*by M***L on 1 November 2022*

Time will tell if it makes a difference, but from experience, these do reduce limescale. Item was really easy to fit.

## Frequently Bought Together

- Calmag SI Scale Inhibitor
- ESI - Energy Saving Innovation Controls ESRTP4RF+ Wireless Programmable Room Thermostat, White
- Zilmet 0.16Ltr Potable Expansion Vessel Shock Arrestor & 15mm Tee

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-03-08*