Fernox F3 central heating cleaner . 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. Quick and easy to remove from the system, saving time on-site. Compatible with all metals and materials commonly used in heating systems, including aluminium. One bottle treats a 130Ltr system, up to 16 radiators or 250m² of underfloor heating. Ideal for new and existing systems.
eBay