If your gonna flush and fill your coolant periodically than don't you think finding such an additive would be overkill? You can avoid corrosion by making sure you don't mix metals, and by making sure the water system is securely grounded. Another solution would be to avoid bright light shining directly to the water system for long length of time as it is said to be a result of algae build up.
The additive your looking for sounds like something that would be used in the medical field or in a laboratory.
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