Wood fuzzies help

So I'm closing to finishing my deck prep work for restaining. It had a solid red stain so I stripped it, then used deck cleaner, and I'm about to use the Defy deck brightner before staining it with Defy deck stain. The flooring has a lot of white in it, that I'm assuming is wood fibers coming up. So I am wondering if you guys think judging from the pictures do I need to do any addition work to the floor? I've already sanded a little off the floor, do I need to sand again?

Thanks for any help!