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adding additive to hydronic system?
I have to replace some shutoff valves so I will be draining the system. I am interested in using a corrosion inhibitor additive. How does one add something like that to a hydronic system? And what's a good one that I should use?
setup: WM WGO-3 oil boiler with WM indirect tank, one circulator doing 2 zones having taco zone valves, and a 2nd circulator for the loop between the indirect and the boiler.