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Swimming pool pumps are of a type known as centrifugal, where an impellor throws water away by centrifugal force through the pump outlet. All modern pumps are manufactured using high strength durable plastics which are immune to the potentially corrosive water. Previously they were cast iron, many of which are still working, but due to come to the end of their life soon.
Ideally they should be sited at a level just below the water level. This minimises the need for "suction lift”, which could strain the pump, and should mean that it is full of water at all times. They should also be sited as close as is practical to the pool, with the connection pipe work as straight and level as possible.
Modern swimming pool pumps require very little maintenance, which can be summarised as:
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Regular (ideally weekly) removal and cleaning of the strainer basket.
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Regular inspection and replacement if necessary of the lid o-ring
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Removal of the pool pump at the end of the season to a warm environment, preventing the possible damage caused by freezing and condensation.
When accurately choosing a pump it is necessary read and understand pump curves. Firstly, calculate the flow rate required, which is derived from dividing the pool volume by the required turnover period. This gives a figure in gallons per minute or cubic metres per hour.
Then it is necessary to calculate the head required, which is a measure of the resistance to the pump flow, ie the distance the water has to travel, the number of bends, the difference in height, etc.
These two figures can be read off on the pump curve chart to find the correct rating required. |
