Getting ready to install new aluminum radiator.  Yellow premium coolant is less than a year old, and though already filtered thru a plastic coffee screen, it is still a very dark rusty-brown.  Hate to dump it (quite expensive) since the old block (and retained coolant) will likely just discolor any new coolant also.  But, if the micro-rust is apt to eventually adhere & accumulate in the radiator passages (and restrict flow), might possibly be worth the expense to minimize risk of any future negative consequences (?).  Opinions?
P.S.  BTW:, also installing an inline hose filter/screen device.

6 VOLTS/POS. GRD. NW INDIANA