What is a pond pump?
In water gardens, fish pools, and other human-installed ponds, features like fountains, waterfalls, and streams aren’t just for decoration. They are essential for preventing the water from becoming stagnant, which keeps the pond clean and helps the underwater ecosystem thrive. Two main types of pond pumps help keep the water moving: submersible pumps and external pumps.
Submersible pumps have the entire pump and motor located underneath the water. Although external pumps are generally considered less expensive than submersible pumps they often require more maintenance and can detract from the aesthetics of the landscaping.
How do they work?
The exact working mechanism of a pond pump depends upon the size and type of pond feature the landscaper wishes to create. Most are powered through an external electrical source, although there are also solar-powered pumps that can be just as powerful as standard pond pumps. For waterfalls or streams, the pump needs to push water with sufficient force to send it uphill to the top of the installation, and this requires relatively little power. In contrast, for a pond fountain, more power is needed to generate enough pressure to jet the water several feet into the air.
Required pump size and power
The water in a pond should be circulated at least once every hour. So if there are 600 gallons of water in the pond, it needs a pump that circulates 600 gallons per hour. This statistic is prominently listed on the labels of most pumps. To measure how much water is in a pond, calculate the cubic footage by multiplying its length, width, and depth. Each cubic foot contains 7.5 gallons of water.
Here are a few pond pump manufacturers to consider.
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