I've drained and replaced a number of radiators around the house, but do not have an expansion tank for the supply. How do I add the inhibitor to the system, and how can I calculate how much to add?
Either take an air tapping out of the top of a radiator and pour it in, or undo the pipe off one of the rads valves on a upstairs rad and pour it in there, after draining the system of course.
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