I made a "bio Tower" and installed it. It did NOTHING, granted it was a little early in the year but still.
It seems that the bio material that is suspended in water gets a lot more gunk and cleans the water much better than the same material will with water pouring through it.
I tried it using mat, bio balls and Kaldis. (Caldis??)
There was no noticable effect. With the same amount of filtration in the pond the water is clear as can be, tests perfectly and the media is filled with green stuff.
I need convincing that a pourus media shower actually works.
Liz