"GrannyGrump" wrote in message
...
I am disabled, and can't clean filters easily, so I am planning on
making a veggie filter from a large water trough (Tractor Supply).
Planning on rocking this in, with a roof, so that it looks like a
wishing well...
This trough has an opening at the bottom for draining water.
I am planning on having water pumped from my pond into the top, so
that it trickles down to the bottom and back into the pond.
I figure lava rock on the bottom, then a layer of gravel, then a layer
of barley straw, with water cress and water plants on top.

Will this work?

GG,

Any amount of dense rooted plants will work well in a VF. I love Hyacinth,
and Ingrid has had fantastic succes with celery. Water cress in a moving
body of water will grow like wildfire, but does not have as dense a root
system as the WH or the celery.

I think your idea is great, except for one thing. Eventually that rock will
get clogged up. How will you clean it?

BV.