Are you conditioning the water at all?
and could the white particulates be bubbles? I thought I had stuff floating around too, but turned out to be bubbles with all the current in my tank. 250GPH power head, spraybar for
canister filter, and
HOB filter, with a bubble stick. Tends to make a lot of bubbles.
Does the water ever get clear, or does it just look bad when you first change everything? You could try.. after rinsing the filter, before you turn it on, put a small bowl or cup under the "exhaust" and turning it on so it will spit it up into the dish/cup instead of the tank. I did that for our Terrarium and it seemed to work very nicely.
Just a thought.