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Pond Pumps - External
Pond Pumps - External
Sequence 750 Pumps
Sequence 1000 External Pond Pumps
Sequence 4000 External Pond Pumps
Sequence Self Primer External Pond Pumps
ValuFlo External Pumps
Sequence Titan External Pond Pumps
Performance Pro Artesian 2 Low RPM Water Pumps
Performance Pro Artesian 2 High Flow External Pumps
Performance Pro Artesian 2 High Head External Pumps
Performance Pro Artesian 2 Speed Pump
Performance Pro Artesian Pro High Flow External Pumps
Performance Pro Cascade Low RPM External Pumps
Performance Pro Cascade High RPM External Pumps
Sequence Priming Pots and Basket Strainers
Sequence Saltwater Pump Seal
Performance Pro Saltwater Pump Seal
Performance Pro Artesian Pump Protec Cover
External pond pumps offer several advantages over their submersible counterparts. They are much easier to access for routine preventive maintenance or repairs. They are generally more durable than submersible pumps and have a longer useful life cycle. External pumps are also available in more powerful sizes than in-pond pumps. They are especially appropriate for high-flow water features, such as waterfalls, and for ponds with a large volume of water to circulate.
The greatest benefit of an external pump is ease of access. There is no need to go into the pond or to remove the pump from the pond to periodically clean filter screens. There is no need to worry that leaking oil will contaminate a pond and kill fish. External pumps are easily hidden from view with standard landscaping techniques and do not mar the scenic beauty of a pond setting. Water is usually drawn to the pump in large diameter piping, and leaves and twigs are caught in a filter basket placed just prior to the pump. It is extremely easy to monitor and empty an external filter basket.
While submersible pumps are less expensive, external pond pumps have longer useful life cycles. This usually equalizes the cost when figured over the useful life of the pump. In-pond pump motors are sealed away from water, and most are considered disposable. When they stop working, they are replaced. External pump motors are not sealed and can be replaced.
Larger flow capacity is often equated to higher operating cost, but energy use should not be the only consideration. Larger pumps are typically fitted with larger piping. Larger piping moves larger volumes of water with less frictional loss. In practical terms, this means that the pump moves larger volumes of water by doing less work. It is quite feasible to run a large external pond pump and use less energy than a smaller pump that must work harder to move the same volume of water. This can make external pumps the more economical choice for circulating large ponds.
External pumps also have some disadvantages. The most significant disadvantage is the priming requirement. Unlike water, air is compressible. Any air gap in the flow of water can cause the pump to lose suction. To avoid this possibility, external pumps usually require a self-priming device. They may also be placed at a grade below the surface level of the pond to facilitate priming.