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Water quality for steam heat system
You should only have to worry about PH, Keep it neutral. Once you fill the boiler and bring it to steam, you will disolve all the minerals and drive out all the oxygen. Make sure all the vents are working properly. IF the system is operating normally and all vents work, you should almost never have to add water to the system. You can use any simple PH test kit (like those used for pools) and test the water annually.