Always Purchase an Efficient Pump Specifically Designed for Pond Use and with a High Flow Rate.
Most beginning pond owners don’t realize this fact, but each pump whatsoever will ultimately cost more (in terms of power consumption, repair & maintenance costs, etc.) to use than the purchase price of the device itself. Some beginning pond owners buy very cheap pumps, even those not designed for pond use, because of the inexpensive “initial” investment. But it is actually wiser to purchase a very expensive pump specifically designed for pond use and with a very high flow rate to begin with. Believe it or not, it has been proven that you’ll simply end up spending less.