Hi

I've got two filters running into a 1600 gal pond. One is a pressurized UV
type at 5000 lts & the other is a 9000 lts biological box type. They work
fine but as ever I'm looking for better water clarity / quality.

I seem to remember reading somewhere that adding an air stone into the media
of a bio filter helps with the filtration of both solids and bacteria etc.

Can anyone shed any light on this?

Thanks