I wouldn't put it in a clean healthy engine no, just change the coolant regularly and that'll keep it clean.
I have, in my time, come across a number of engines which hadn't had new coolant for a long time, or had been topped up with plain water because of leaks, and were filled with rusty brown goop. In those cases, they would benefit from this stuff after a coolant flush to clean out the rest of the crud ready to accept fresh coolant. There is some sediment left in the bottom of the tank, but most of it seems to be held in the solution so should flush out without any issues.
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