i am new to the pond world searching for a small pump that can do about 700-1000 GPH, i have approx. 700 gallon pond. i would like a external pump. the pump will discharge into my 55 gallon drum and exit from the top. the pump must be strong enough to rise about 4 foot. I am looking at a pondmaster supreme mag drive 1200 GPH. its affordable at $110 on ebay. Any advise?