I just never have reused trans fluid. But that was easier when I could get it at Walmart for $4.77/qt than now that it's $11.
The paint strainer gets the big stuff out like sand and stuff from the pan rail when pulling the pan, and any aluminum or steel breakdown.
They are around 120-190 micron filters. The typical Dacron sump filter is around 50. So the sump filter will do it’s job.
And all filters get more efficient after they have been used. I would reuse the sump filter unless really crappy.
