All pumps are better at pushing water than pulling water. The intake of my
pump is about 15 feet from the pond in a shed, but the water flow is gravity
to the pump. If you look at performance curves for some of the pumps, they
will have a 2 or 3 for lift on the suction side, and a 20 foot lift on the
discharge side.
--
RichToyBox
http://www.geocities.com/richtoybox/pondintro.html


"gribbee" wrote in message
hlink.net...
I've been using submersible pumps because there is no easy way to hide an
external pump around my pond. I do have a wooded slope 20-30 feet away
from
the edge of the pond, so I decided to snake a stream down the slope with a
couple of small vf pools along the way. My plan was to bury flex pvc from
the pond to the external pump hidden behind a bush next to the top pool
and
run the electric back to a shed rather than near the pond.

So I ordered a Sequence Cimmaron. When I got it in and started reading
the
documentation, it says to push water instead of pulling. In other words,
put the pump by the pond and not hidden up the hill.

Is my plan screwed? If I set it up as I planned, sucking water through
about 50' of 2" pvc and up about 4', am I going to have problems? Would
it
make a significant difference if I had the pump in the middle, 25' from
the
pond, but before the slope? FWIW, the pump is rated for a little less
than
3000 gph at 4' height.