Mark Bannister wrote:

Maybe this is a stupid question, but why not run the veggie filter
backwards and pull into the filter from the bottom?
My pond looks like this in cross section:

|~~~~~~~~~~| water level
| | | divider wall level
| ||
|__|_______|

Ah. This is the post you meant. It helps if you provide some context.

Nothing wrong with the idea at all. Upflow filters have the additional
advantage that they tend not to compact the filter media.
--
derek