It depends on the height you are trying to lift the water too.

Here is the last pump I bought: https://www.amazon.com/gp/product/B006M6MSHE/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

I was running it up 6 feet, so I was getting about 600 gallons per hour. There is a good chart on that product page that can clue you in for what you need specifically.