yes. a good friend has an aquatic plant business and has both duckweed and azolla
that had overwhelmed her plants and kept the water too cool in her greenhouses. She
puts a pump into a container and then sits the container so that the front edge is
just below the surface and as the water and floaters get sucked in they stay in the
container and she cleans it out when needed. surprisingly it creates a kind of slow
river in the 44' x 11' wide ponds in the greenhouse so eventually most of the "stuff"
gets pulled in.

Ingrid

On Sat, 21 Mar 2009 11:03:43 +1100, "David Hare-Scott" wrote:
Before I re-invent the wheel has anybody tried this or heard of it being
done? By what method?

David