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Fernox 500ml F3 Cleaner is ideal for the removal of flux residues and other installation debris to help extend the life of the boiler and the efficiency of the system. It is an effective, universal pH neutral, non-foaming liquid cleaner, which removes sludge, scale and debris from existing central heating systems to restore heating efficiency and eliminate boiler noise. Suitable for use when powerflushing to accelerate the cleaning process in existing and contaminated systems.