so ive been toying with getting some galvanised planters (set of 5
matching
but getting smaller each time

Want a cool looking filter set?

Get 3 or 4 oil changing pans, deep saucer shaped with a spout in one
end.

Set each one on graduated logs, rocks, etc, at a tilt.

Run your water to the top one...water will spill through the spout to
the next, and next, etc until it reaches the pond.

Put plants all around it if you like.