Fernox F3 Express 400ml | Fast-Dose Heating System Cleaner Heatmiser Smart Plug Does not cause blockages: The

Does not cause blockages: The F4 Leak Sealer is specially designed to seal without clogging

Fully compatible with hot water and central heating zone valves

filling loop or TF1 filter

Fully Boiler Plus compliant

Fernox F3 Express 400ml | Fast-Dose Heating System Cleaner Heatmiser Smart Plug Does not cause blockages: TheFernox F3 Express (Aerosol) 400ml Fernox F3 Express is a pH neutral, non foaming cleaner designed to remove sludge, scale, and debris from central heating systems. It helps restore efficiency, reduce boiler noise, and prepare new systems by clearing out flux and installation residues. The Express canister uses Barrier Pressure Pack technology, which keeps the propellant separate from the active product, preventing air from entering the system and