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This is the most complicated way of adding inhibitor to your system, but it is an important method to know if you have a pressurised central heating system.
Jimmy the Plumber takes you step by step through this process with his usual charm and panache! As he mentiones in the video, this is a complex method, so we advise you watch the video carefully and only attempt putting it into action if you have a good working knowledge of your heating system and are used to carrying out more difficult DIY jobs around the house.
Article by Benjamin Clarke