---
product_id: 48819827
title: "56600 500ml F3 Cleaner"
brand: "fernox"
price: "C$3921"
currency: NIO
in_stock: true
reviews_count: 8
category: "Fernox"
url: https://www.desertcart.ni/products/48819827-56600-500ml-f3-cleaner
store_origin: NI
region: Nicaragua
---

# Cleans up to 100L or 10 radiators Up to 15% gas savings with Protector F1 Neutral pH formula - safe on all metals 56600 500ml F3 Cleaner

**Brand:** fernox
**Price:** C$3921
**Availability:** ✅ In Stock

## Summary

> ♻️ Clean smarter, heat greener, save bigger!

## Quick Answers

- **What is this?** 56600 500ml F3 Cleaner by fernox
- **How much does it cost?** C$3921 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/products/48819827-56600-500ml-f3-cleaner)

## Best For

- fernox enthusiasts

## Why This Product

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

## Key Features

- • **Eco-Smart Heating Boost:** Combine with Protector F1 for up to 15% gas savings—cut costs & carbon footprint
- • **Universal Compatibility:** Safe for all metals & materials in central heating systems—no corrosion worries
- • **Effortless System Revival:** Removes sludge, limescale & debris to restore peak heating efficiency
- • **DIY-Friendly & Non-Hazardous:** Neutral, COSHH zero-rated formula lets you clean while system runs normally
- • **Trusted by Pros & Homeowners:** Top-rated cleaner with 4.5 stars and proven results on systems up to 25 years old

## Overview

Fernox 56600 F3 Cleaner is a 500ml neutral, non-hazardous liquid designed to efficiently remove sludge, limescale, and debris from central heating systems. Compatible with all metals and materials, it restores heating efficiency and reduces boiler noise. When paired with Protector F1, it delivers up to 15% gas savings. Suitable for DIY use and professional power flushing, it treats systems up to 100L or 10 radiators, certified by the Carbon Trust for a reduced environmental impact.

## Description

Product Description Fernox Neutral universal cleaner for pre-commissioning new systems in accordance with BS7593:2006. Removes sludge, limescale and other debris to restore heating efficiency of existing systems. When used in conjunction with Protector F1, gas savings of up to 15 percent can be achieved every time you heat your room. Carbon Footprint certified by the Carbon Trust. Compatible with all metals and materials commonly used in heating systems. Easy to use, system can be left running normally during cleaning. Suitable for use with all known power flushing machines. Neutral, non-hazardous formula (COSHH rated zero). Volume: 500ml.Fernox Cleaner F3 is a quick and effective neutral cleaner for central heating systems. It is designed to remove all debris, sludge and scale from existing systems of all ages. In this way, it will restore heating efficiency and eliminate or reduce boiler noise.For older sludged systems, Cleaner F3 is particularly effective when used in conjunction with a power flushing unit. If the system is heavily scaled the use of Fernox DS40 System Cleaner is recommended. Cleaner F3 is a neutral, non-hazardous product that is well inhibited and compatible with all metals and materials commonly used in heating systems. Box Contains 1 x Cleaner F3 Liquid bottle 500ml

Review: Brilliant product! - Brilliant product, we now have several radiators working seamlessly that were blocked for years. Also, Fernox provide speedy and extremely invaluable customer service on your inidividual situation. For us, Fernox F3 was used to clean a solid fuel system that hadn't been cleaned for 25 years, comprising 10 radiators, several double. They advised 2 bottles to be placed in the header tank to remain in the system for up to 2 weeks, followed by 3 flushes out, then 2 bottles of Fernox F1 to keep the system in good working order, which then stays in the system. (These are double the amounts a cleaner/smaller system would have required). It is important to clean out your header tank before you begin (and keep it clean in the future) as you don't want additional gunge going round your system. Flushing out after Fernox F3 is time consuming - we left the pump on, with the water running into the header tank, as we let the water flow through a radiator drain at the system's lowest point, attaching a hosepipe running to our main drain, for approximately 2 hours on 3 consecutive days. Make sure the water isn't draining out faster than the water going into the header tank, as in that way, there will less trapped air. Very doable as a DIY task and avoiding the expense of powerflushing.
Review: Fernox system cleaner - I used to work in maintenance and this product was the goto item the plumbers used when clearing blockages.

## Features

- Contains a mixture of 5-Chlor-2-methyl-2H-isothiazol-3-on und 2-Methyl-2H-isothiazol-3-on (3:1) (CIT/MIT). May produce an allergic reaction.
- Removes sludge, flux and debris from new and exisiting central heating systems
- When used in conjunction with Protector F1 gas savings of up to 15% can be achieved
- Neutral universal cleaner for pre-commissioning new systems in accordance with BS7593:2006
- Treats 100L system or up to 10 single radiators
- Compatible with all metals and materials commonly used in central heating systems

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BL8CW9W |
| Best Sellers Rank | 43,895 in DIY & Tools ( See Top 100 in DIY & Tools ) 440 in Central Heating System Accessories 3,574 in Adhesives & Sealers |
| Brand | Fernox |
| Brand Name | Fernox |
| Contains Liquid Contents? | Yes |
| Country of Origin | United Kingdom |
| Customer Reviews | 4.5 out of 5 stars 781 Reviews |
| Global Trade Identification Number | 05014551999787 |
| Item Form | Liquid |
| Item Volume | 500 Millilitres |
| Item Weight | 0.68 Kilograms |
| Item form | Liquid |
| Item volume | 500 Millilitres |
| Manufacturer | Fernox |
| Material Features | Central Heating Cleaner |
| Material feature | Central Heating Cleaner |
| Number of Items | 1 |
| Scent | Unscented |
| Special Features | Non Abrasive |
| Specific Uses For Product | All Purpose |
| Specific uses for product | All Purpose |
| Surface Recommendation | Metal |
| UPC | 798256134746 |
| Unit Count | 500.0 millilitre(s) |

## Product Details

- **Brand:** Fernox
- **Item form:** Liquid
- **Item volume:** 500 Millilitres
- **Material feature:** Central Heating Cleaner
- **Number of items:** 1
- **Scent:** Unscented
- **Special feature:** Non Abrasive
- **Specific uses for product:** All Purpose
- **Surface recommendation:** Metal
- **Unit count:** 500.0 millilitre

## Images

![56600 500ml F3 Cleaner - Image 1](https://m.media-amazon.com/images/I/61kn7f1EGQL.jpg)

## Questions & Answers

**Q: is it easy to use**
A: Very easy. Switch your water off. You shouyld have a means to do this near your small water tank which is probably in your loft. Drain your system. Just a hose pipe on the drain taps on probably two of your downstairs rads. pop the F3 in your small tank in the loft and turn the water back o. remember to close ther rad draining taps first. You'll need to let the air out of your rads (bleed) when you drain and refill your system. Keep it in for a week and then drain the system to remove sludge. When you refill for the second time add F1 and leave it in. E.ON told me i needed a powerflush to sort out my boiler problems (£400) but a friend told me about this. Used this and haven't had any boiler issues since

**Q: Is this product suitable for oil fired central heating system. A plumber just told me to buy Fernox stuff but I see there are a few different kinds?**
A: What heats your water/heating doesn't matter: it's more important if it's a vented or closed/pressure system. If its standard open vent, ie: it has a tank up in loft, any good quality system cleaner will do. Fernox F3 is a good gentle cleaner that won't be too aggressive as on old pipework, you can make problems with very strong stuff!

**Q: To Supplier It says this 500ml but then under size name it says 275ml which is it pleased is it just amazon listing error?**
A: Hi, 
It’s 500ml. As stated ‘ 	
Fernox 56600 500ml F3 CleanerFernox 56600 500ml F3 Cleaner’ must be an error

**Q: Can this be used in car cooling system as a flush?**
A: Technically, it seems, using it in a car is less hazardous then indoors. But it depends on the amount you use. Household central heating systems do not use rubber seals or washers, but car cooling systems do, this may damage rubber seals or washers over a period of time.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Brilliant product!
*by S***N on 26 February 2018*

Brilliant product, we now have several radiators working seamlessly that were blocked for years. Also, Fernox provide speedy and extremely invaluable customer service on your inidividual situation. For us, Fernox F3 was used to clean a solid fuel system that hadn't been cleaned for 25 years, comprising 10 radiators, several double. They advised 2 bottles to be placed in the header tank to remain in the system for up to 2 weeks, followed by 3 flushes out, then 2 bottles of Fernox F1 to keep the system in good working order, which then stays in the system. (These are double the amounts a cleaner/smaller system would have required). It is important to clean out your header tank before you begin (and keep it clean in the future) as you don't want additional gunge going round your system. Flushing out after Fernox F3 is time consuming - we left the pump on, with the water running into the header tank, as we let the water flow through a radiator drain at the system's lowest point, attaching a hosepipe running to our main drain, for approximately 2 hours on 3 consecutive days. Make sure the water isn't draining out faster than the water going into the header tank, as in that way, there will less trapped air. Very doable as a DIY task and avoiding the expense of powerflushing.

### ⭐⭐⭐⭐⭐ Fernox system cleaner
*by G***N on 27 January 2026*

I used to work in maintenance and this product was the goto item the plumbers used when clearing blockages.

### ⭐⭐⭐⭐ Great product, much cheaper than a plumber
*by S***A on 15 September 2016*

I purchased this because I was having some problems with my hot water system and wanted to give it a good flush to start with to ensure the problem was not a simple blockage. I know Fernox to be a good trusted brand and with the price on amazon I could not find it a lower price anywhere else so I purchased some. First I completely emptied the total system and gave the header tank a good clean the as the system refilled I added the cleaner, I only used 1 bottle although I have a 10 large radiators in the house I had not used the product before and so thought 1 bottle to give it go would be best to start with. Once the system was full again and all the rads bleed I turned the boiler on and ran the heating and hot water for 2 hours, then ran it again later in the day and again the next day. then I emptied the system again and wow the water coming out was very black and so I know something had happened. I refilled the system and ran it again, did this one more to give it a good flush and on the last fill I added some Fernox protector. Since I have done this the system has worked fine (the old problem was the boiler kept cutting out from over heating) the boiler even sounds quieter, now I can say this will fix all problems but it certainly fixed my issue and saved me a small fortune from getting a plumber involved. I now plan to use the cleaner once a year and give the complete system and good clean.

## Frequently Bought Together

- Fernox 56600 500ml F3 Cleaner
- Fernox 56599 F1 500 ml Central Heating Protector
- QuickFill - SEL9260: Central Heating Dosing Tool - Add Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100 to Your Central Heating System

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*Product available on Desertcart Nicaragua*
*Store origin: NI*
*Last updated: 2026-03-04*