This pack contains a system cleaner, system sealer and system inhibitor. For best use of a system sealer it is recommended to thoroughly clean the pipework, valves and boiler surfaces before applying the chemical sealer. This allows the sealer to have a very high percentage chance of finding and permanently sealing the leak. After the sealer has fixed the leak the chemical should be removed, the system should be flushed with fresh water and the corrosion inhibitor should be added to prevent any further degradation. For a full descriptioin of the use of each product, please open the technical installation manual attached to each one.