Pumps In Koi Ponds. Several Points To Consider

Pumps for koi ponds can be either submersible or external. External pumps can be subdivided into suction, circulation, or pressure types. Whichever you choose, make sure it is powerful enough for the task it is to perform.

The simplest task that a pump is required to undertake is either to pump water into an above waterline filter system or pull the water through the filter and pump it back to the pond.

If there is to be an extra loading, such as feeding a high waterfall, you will require a more powerful pump. The loading will be even greater if you include equipment such as ultraviolet clarifiers and heaters in the design.

You may need to split the load between two pumps or use a larger capacity pump. Some pump manufacturers design pumps specifically for pond use, but you can use other pumps.

Always consider technical specifications carefully before making a choice. The two parameters that are usually clearly shown on packaging are flow rate and the head at which the pump will achieve it.

Flow rate will normally be quoted as liters per minute or gallons per hour. The head will be given in meters or feet. Sometimes a graph is supplied that shows how the flow changes with different head levels.

Generally speaking, the higher the pump has to push the water, the less water it will pass; this means that the flow rate drops. Bear in mind that the manufacturer's figures are also related to the diameter of pipe used in the installation.

If you choose to use a smaller diameter pipe, the pump must work harder and the flow rate will decrease. There are other aspects to consider when choosing a pump. Any bends along a pipe run will restrict the water flow, causing a reduction in overall flow rate.

If you use a flexible hose, do not bend it too sharply around corners or allow it to kink. With hard plastic pipe, incorporate sweep bends wherever possible.

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