Sorry if being repetitive. When ready to run, use an upper hose filter. Here are a few examples. If you Google Coolant Filter, may find more. May have missed recommendations from others on the Barn. Google each commercial type with "review" to see other's opinions. Just be sure to check the filter often. If leaving it in and being lazy for a combined radiator/block flush and backflush, clean the filter before every flush, and before every back flush.
Panty Hose - install in hose closet to Head. Cheap, does a good job even on fine particles. . Downside have to remove hose and drain some coolant to check frequently.
Dryer screen inserted in hose - cheap, must take hose off for cleaning/inspection. Again have to partially drain coolant
Various fine screen material inserted in the hose including strainer materials in Walmart Kitchen wares. Must take hose off for cleaning/inspection. Again have to partially drain coolant
Homemade and handy is limited only by your and other's imaginations.
Tefba Coolant filters - Most expensive choice I see. Install close to radiator, cut hose to install inline, has cap for inspection and filter removal cleaning.
No/or very small loss of coolant when inspecting/cleaning. I am trying this one soon. May rig up some type of a clear cap for viewing.
https://www.tefbafilters.com/
Gano Coolant Filters
Cut Hose to install inline, can be ordered in clear material for easy inspection of the filter, and allow viewing of coolant flow. The design also traps most of what it filter to prevent stuff from falling back into the block. May be a little more difficult to clean I believe it has to be disconnected to clean it out. Not the most expensive, but not cheap. Seen a lot of barn members happy with it.
http://www.ganofilters.com/
Here is a barn string that in addition mentions a Caterpillar filter along with the Gano filter.
https://www.fordbarn.com/forum/showt...coolant+filter
Champion - seen it mentioned on the barn, Inline, clear window for inspection, filters can be cleaned, expensive, personally not familiar with them. Again have to partially drain coolant. Not the most expensive, but not cheap.