Dan Espen writes:

Dale wrote:
I've got a small pond (800 gallons) that needs to be cleaned out. I won't
get into it, but I want to use a garden hose to drain the pond. Isn't there
some sort of gizmo that can be attached to a hose to create a pretty healthy
vacuum? Where can I get one? Thanks.

Pool cover pumps can do 800 gallons in 1 or 2 hours.
(The pumps are rated for GPH.)

They're reasonalby cheap and resist clogging.

I should have mentioned, they are designed to work with your
garden hose.