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External Pond Pumps - Cons And Pros
 
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    When should you opt for an external pump?

    Well, external pond pumps are usually the better choice if you have a large pond (1000 gallons or more). Because you need a lot of power to produce the necessary circulation of water, you will find that an external pump is a big money saver because it is more energy efficient.

    An example: If you need a big pump, let's say 6000 Gallons per hour (GPH), you could run an external pump at around 450 watts. If you compare this to an submersible pump, that figure would be closer to 1000 watts (or more even). Since you want your pump to run 24/7, you will be surprised at the difference this will make for your energy bill. And of course there is some environmental impact to consider here as well.

    Apart from being more energy efficient, an external pump usually lasts longer than a submersible one. Since pumps don't come cheap, it's important that you don't have to make an investment like this every few years.

    Another benefit is that external pumps usually work very well with biological filters. This is important, because using a filter will cause a lot of back pressure on the pump itself. Therefore, you need a "heavy duty" pump to still produce a sufficient amount of circulation, and get the job done without damaging the equipment.

    And last but not least: External pumps are very easy to clean. They come with a priming pot and also a leaf strainer which will be easy to access without having to get the pump out of the pond (which is a lot of hassle and will get at least your hands wet).