Cleaner F3 500ml

Product Code: 56600

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Cleaner F3 is an effective cleaner to remove sludge, scale and debris from new & existing central heating systems.


Cleaner F3 is an effective, universal pH neutral cleaner. It removes sludge, scale and debris from existing central heating systems to restore heating efficiency and eliminate boiler noise. When commissioning new systems in accordance with BS 7593:2019, Cleaner F3 removes flux residues and other debris to help extend the life of the boiler and the efficiency of the system. It is ideal for use when powerflushing to accelerate the cleaning process. Available in 500ml liquid bottle & 400ml Express aerosol canister. It is a non-hazardous product which is compatible with all metals commonly used in heating systems.

  • Neutral universal cleaner for pre-commissioning new systems in accordance with BS 7593:2019
  • 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% can be achieved every time you heat your room
  • 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 powerflushing machines
  • pH Neutral, non-hazardous formula (COSHH rated zero)
  • ISO14001

Application and Dosage

One 500 ml bottle of Cleaner F3 is sufficient to clean a typical domestic central heating system (average 16 radiators or 130 litres). Additional/repeat applications of Cleaner F3 may be necessary for larger systems, or if systems are heavily sludged. First drain and refill the entire system with plain water. For optimum results the entire system, including drop feed radiators where fitted, should be completely drainable. Preferably, full bore gate valves with hose connectors should be provided temporarily for this purpose. Motorised and thermostatically controlled valves must be set so that no part of the system is closed off during cleansing or rinsing. Discharges must be made to the foul drain and not the surface water drain.

Physical Properties

Colour: Dark amber
Odour: Faint
Form: Liquid
pH (conc): 7.0 – 7.5
pH (0.5% soln) 7.5 – 7.8
SG: 1.20 @ 20°

Packaging, Handling and Storage

Fernox Cleaner F3 is supplied in 500 ml containers. Fernox Cleaner F3 is not classified as hazardous but, as with all chemicals, care should be taken. Do not mix with any other chemicals other than Fernox products stated. Keep out of the reach of children.

How do Fernox Cleaners work?

How do Fernox Cleaners work?

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