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. James the plumber takes you step by step through this process with his usual charm and panache!
As he mentions 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.
You can purchase chemical inhibitor on our website here.