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I normally use a belt sander to get rid of planer marks. I'm surprised you are getting swirl marks with 150 grit paper. Your sander must run a bit slow. Anyway after sanding with 150 if you would wet the wood and raise the grain you could sand it again with 220 grit paper which should take out the swirl marks. Raising the grain between grit changes makes you sanding more effective.

If you do a lot of treads you might think of getting better sanding equipment. You might get a drum sander or timesaver sander which you could put finer and finer paper on it until there was no need for the orbital sanding. Personally myself I like a stroke sander. The seem more versatile.
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