Not worth it in my opinion. The part that sucks up the debris is maybe
3-4 inches wide. Think about maneuvering a 4 foot pole with a vacuum
and hose attached to it across the bottom and sides of your entire
pond. It really isn't practical unless you have a very small pond.
As the other poster pointed out, the hose that creates the vacuum also
puts chlorinated (unless you have a well) water into your pond.
Obviously not a big deal for a quick cleaning, but bad for a major
cleaning.