When I built mine, 38000 lbs of unwashed gravel, baby plants in the bog, it took a few weeks to clear., if I recall right. A lot of dirt in that pond.
I turn over the water about once every two hours. Now if I make a total mess, which I do, and murk up the water by the next day it is clear. I don't run as much flow as others.
It will clear, patience!
Or get some quilt batting and put it where the water flows through it. It will filter out a lot of the dirt. Rinse repeat, I am too lazy to ever do that. (well too busy)