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Should I add a Wye filter to my radiator system while I have the chance?

Part of my system is valved off with 1 inch galvanized pipe, to go to pex.
I considered adding some treatment chemicals in the spring but was warned that lots of crap may come lose. I have to drain my system this summer.

Should I add a filter and what kind and pore size?
Home owner near Minneapolis with cast iron radiators, one non working slant fin now ripped out, and hot water heat.