Pond Pumps are specifically designed for their function. There is a little overlap between categories, but we have divided into 3 main areas:
Filter pumps: economical to run, designed for continual use, pumping water through a large diameter pipe and not too high. These can often be used to run a  watercourse.
Fountain Pumps: more expensive to run, designed for pumping clean water up high.
Variable Flow Pumps: These come with the ability to reduce flow rate (and power consumption) to suit the application / time of year / running cost.