Your post reminds me of seeing your vf long ago in a post.
Efficient! I have forgotten how big your fish load is. We get a
couple of inches of muck in each barrel (3 of them) and on the botton
of a total of 20 X 4 of veggie filter. The sequence that does best is
the 55 gal drum followed by a 4 x 4 followed by a 4 x 8. The 4 x 4
gets the most muck. The 4 x 8 gets the remainder. Bonnie's water
celery have now filled the 4 x 4. Their roots are a formidible
mechanical and bio filter. They also allow for lots of
sedimentation. Once the hyacinth have filled the next filter, there
will be another 32 sq ft of sedimentation plot. As before, I
anticipate throwing bushels of hyacinth away. They have all begun to
send out daughter plants.

Beat changing filter pads!

Jim