Fernox F3 Cleaner (500 ml) is a chemical cleaning agent formulated to remove installation debris, oils, greases, and loose corrosion products from central heating systems. It’s intended to be used before adding corrosion inhibitors, helping prepare the system for long-term protection and efficient operation.

Function & Purpose

During installation or servicing of a heating system, contaminants such as soldering flux, metal filings, sealant residues, and rust particles can remain in the system water. These impurities can reduce flow, impair heat transfer, and lead to cold radiator spots or noisy pumps. F3 Cleaner works by dispersing these contaminants into the system water so they can be flushed out during a system flush. It prepares the heating circuit for the addition of a corrosion inhibitor, improving efficiency and helping extend component life.

Compatibility

This cleaner is suitable for use in sealed central heating systems, including combi, system, and conventional boilers. It is formulated to be compatible with typical heating system metals such as steel, copper, and aluminium when used according to instructions.

How It Works

The 500 ml bottle is added to the system via an appropriate filling point, such as a filling loop or filter connection. The heating system is then run for a period as recommended, allowing the cleaner to circulate and break down debris. After the cleaning period, the system should be thoroughly flushed with clean water to remove suspended contaminants. Once flushed, a corrosion inhibitor should be added to protect the system over the long term.

Key Benefits

Using Fernox F3 Cleaner helps improve circulation and heat transfer by removing soluble and suspended contaminants early in the system’s life. It reduces the risk of performance issues, prepares the system for effective corrosion protection, and supports quieter, more efficient heating operation. By removing debris before it settles, the product helps prevent future blockages and wear on the boiler and components.

Ideal Applications

Fernox F3 Cleaner is ideal for new central heating installations, boiler upgrades, or systems that have been drained and refilled after repair. It’s commonly used as part of pre-commissioning preparation or during servicing to ensure the system is clean before introducing a corrosion inhibitor or long-term conditioner.

Usage Note

Always follow the manufacturer’s dosing and safety instructions. After cleaning with F3 and flushing the system, add a suitable inhibitor to ensure lasting protection against corrosion and scale formation.