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If you install a filter, just run straight water for awhile till its finally cleaned a few times. That way you don't waste money on coolant.
Cummins Diesel Engines marketed a spin-on coolant filter system, that included the mounting base, fittings, hoses and instructions to adapt to any liquid cooled engine. The actual filter assembly resembled a larger PH8A oil filter, although larger in length and diameter, that contained the filter element and corrosion inhibiting chemicals that dissolved to protect and filter the coolant in the engine and radiator. Worked very well.
BOB RENTON