Reusing Coolant after Draining?

All I've ever used is a paint strainer to catch the lumps. They lay in the bottom of a funnel real nice.

 

The 110 - 120 works just fine for me.

 

I usually drain coolant in to clean buckets. I just pour it back in the radiator.

To be sure the liquid going in doesn't have any large impurities use a funnel with a screen or strain the liquid thru a coffee filter

I only reuse fluid if the reason to drain is to change a cooling system component.
If the motor overheated or fluid is contaminated with diesel,def or oil don't reuse it. I also strip test it for pH balance

 

You should be draining it a clean bucket, then just pour straight back into the engine. If you need, a fine mesh strainer would be fine.

 

Then theres the ol tee shirt in the funnel!