Please recommend a flush and antifreeze

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I have a largish hydronic system. Multiple parts are outside and exposed to freezing.

The system was designed for antifreeze. The antifreeze used turned out to be a bad batch and ate through the core of my Aluminum boiler core. I don't know what other damage to valves may have occurred; but I would be interested in feedback from anyone else with this experience.

My current problem. I am refilling the system. I need something to flush the system and then an antifreeze that will not destroy my system again. Preferably with protective additives and long life.

I am looking for a recommendation for the best products to accomplish these two things.
 
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