Filtering, Oxygenating and Circulating
A pond pump filters, oxygenates and circulates water in the pond. This is a continuous process and should not be interrupted for any length of time in ponds with fish because the fish will suffocate without sufficient oxygen in the water.
Garden pumps also filter debris from the water. If there is too much algae, much of it will be sucked into the pump's filter where it remains until the pump is removed and the filter either cleaned or replaced.
Submersible pumps are the most reliable and desirable because they are simple to install, require little actual plumbing and do not require
A Vacuum for Water
The pump pulls the unfiltered water into its intake, located at the center top of the device, just like a vacuum pulls debris from a rug in a home. This water is then pulled through a filter device, usually made of a netting material with tiny holes. This filter can be removed for cleaning or replaced. Once the water is filtered, it is jetted out from the pump through another port, and returned to the pond, fully oxygenated. All of this is run by a small motor powered by household electricity. Putting electrical devices into a body of water is not usually advisable but the electrical components of submersible pumps are all fully protected and insulated.
Keep the Pond Levels High
The internal components of a garden pond pump include a motor, a rotating impeller (the suction device) and the volute, which is a spiral shaped structure through which the water flows on its way out of the pump. It is important that the water level in the pond remain higher than the top of the submersible pump, as water enters through the top. If the water level gets too low, a loud sucking noise can be heard coming from the pump and the amount of water being circulated decreases dramatically. Water lost to evaporation must be replaced.
Maintain the Filter
When the pump no longer spews out filtered water at the same velocity it once did, the filter probably needs to be cleaned or replaced. Shut off the power, remove the pump, take off the top and remove the filter. Most filters can be replaced after thorough cleaning.
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