Ponds add an aesthetic feature to the garden landscape and are commonly constructed for ornamental purposes. Nevertheless, as they are man-made, they are stagnant water bodies lacking a natural water source. Therefore, they should be cleaned regularly to prevent moss and algae growth and to maintain the oxygen content of the pond. A pond pump serves the purpose by providing the necessary circulation and aeration for the pond. It also prevents the growth of undesirable vegetation. A typical pump should circulate half the water per hour or the whole water content per hour in the case of fish ponds like koi ponds.
Apart from providing the basic circulation in a pond, a pond pump is also necessary for additional features, such as waterfalls, artificial streams or fountains. Several brands of pumps are available at various prices, but safety should be the priority while choosing a pump. It is vital to keep in mind that a pond pump is an electrical device installed in water, and could pose a great hazard if it is not done properly. An outdoor power outlet with GFI (Ground Fault Interrupter) is essential, as the GFI is a safety feature, which breaks the circuit if at all, the water happens to make contact with electrical devices. It is best to keep the outlet at a distance of about ten feet from the pond.
Smaller pumps are rated as GPH or Gallons Per Hour, while more powerful devices are rated in horsepower. It refers to the quantity of water pumped per hour to a particular height. The required pumping height above the water surface is referred to as the head. Therefore, the flow rate is highest when the head is zero and reduces as the head increases. Consumers must check the flow chart of pumps to make sure that its flow rate is sufficient to match their pond’s requirements.
Pond pumps are either external or submersible. External pumps are positioned outside the water body and they can be kept safe from pollutants, sand, etc. But, they are usually noisy and affect the peaceful environment of the pond area. Submersible pumps are positioned inside the water and their operation is silent. The only hassle is that they need to be taken out for cleaning and repairs. Magnetic drive pumps are more popular today, and they function with impellers that float in a shaft housed in the pump. They do not require oils and coolants that could harm the water in case of a rupture or leakage. Further, they are simple with minimal chances for problems or repairs.
Solar pumps are feasible for smaller ponds, as they are less powerful. The main advantage is that they are powered by solar energy, a renewable resource, which is safe on the environment and also inexpensive. Some people make a grave mistake by shutting off the pump at night, but it is dangerous as it aggravates the natural fall in oxygen levels in the pond, during the night. Therefore, it is essential to retain constant water movement in the pond to keep the fish alive.
