The 290ml Fernox F3 super concentrate cleaner is a neutral universal cleanser for pre-commissioning new systems or restoring heating efficiency of existing systems. Quick and easy to apply via one of the radiators  even with the system running  it removes sludge, scale, flux residues and other debris. Compatible with all metals and materials commonly used in heating systems  Ideal for pressurised systems and combination boilers  Universal applicator included  Patented application  Non-toxic, environmentally friendly formulation Fernox F3 Super Concentrate Cleaner 290ml