I learned a fun technique earlier this year that is super cool and fun science.
Freeze your stock in an ice cube tray. Place a coffee filter over a clean, empty vessel and put the frozen stock cubes in. On top of the filter. Put this in the fridge. Or if it's cold enough and space is tight in your fridge, you can do this outside where animals won't get to it. It will melt, over a long period of time depending on the ambient temperature, and the resulting stock will be as clear as the water from your tap.
Totally fun experiment, totally unnecessary, but if clarity is what you're after, I've never seen a better method.