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As swimming pools become an increasingly popular feature in gardens, it is important for owners to choose the right pump to run their pool. Selecting the correct pump can reduce maintenance and energy costs. Before you decide to buy a pump, always try to compare several brands in terms of design, energy consumption and pumping performance. It is not only the choice of brand that matters, but also selecting a specific model suitable for the size of your pool.
Pumps have been part of everyday life for several thousand years. The first modern pool filtration systems used gravity to filter water through a filter. This method was extremely inefficient; over the last 40 years these pumps have been replaced by modern pressure filtration systems. Development in pumping technology continues, and designers are creating more efficient and quieter pumps for commercial pools.
Choosing a pump may initially seem like a very complicated matter. Not only does it require considerable knowledge of the industry, but also an understanding of the different kinds and types of pumps. To select the optimal pump, all options must be carefully considered. The most common mistake when choosing a pump is oversizing its capacity – the pump is too large. The following lines may help you understand the issue better and advise you on selection.
Swimming pool pumps often run longer than necessary. Circulating the pool water mixes the chemicals and removes sludge. However, when the water is circulating during the application of chemicals, the chemicals remain mixed, so continuous circulation is not required. Nor is constant circulation necessary to remove small debris; a large amount of debris in the pool can also be removed with a skimmer or a pool vacuum. In addition, continuous circulation does not guarantee reduced algae growth; a better alternative is to use chemicals and clean the pool walls.
Reduce filtration time to 6 hours a day. If the water does not seem completely clear, increase the filtration time in half-hour increments until the situation improves. In the study mentioned above, users who reduced filtration to 3 hours a day were still satisfied with pool water quality, with an average pumping cost saving of 60%.
You can also install a timer to control pumping. If fine debris is the issue, it is advisable to set the timer to switch on several times in short intervals during the day. This option is better than letting the pump run continuously for, for example, 3 hours, as during the remaining 21 hours your pool would collect debris. Several shorter cycles will keep it clean throughout the day.
Keep the suction grilles as clean as possible. Blocked drains force the pump to work harder, which consumes more energy. Backwash your filter regularly to save energy when using a swimming pool pump.
When choosing a pump for your pool, you need to take the pump size into account: the smaller the pump, the more you will save on energy. On the other hand, the pump must be powerful enough to handle cleaning the entire volume of water. In general, however, there is no need to oversize a swimming pool pump. By following the rules below, some users achieved energy savings of up to 75%. The aspects to consider when operating a swimming pool pump are as follows:
*the above data are presented based on research by the Energy Saving Centre, Florida Atlantic University. They may vary depending on location / energy price. However, by optimising pump parameters you can generally save between 40–75%
The larger the pump, the higher your maintenance costs will be. Therefore, it is best to have the smallest possible pump for a given pool size. Studies show that, in general, a pump with an output of 0.75 horsepower (=560 W) is sufficient. Smaller pumps can also be used if you reduce the hydraulic resistance in the pool circulation system; to do this, the following is required:
Install a larger filter (more precisely, you should install a filter designed for at least 50% higher flow rate than that in your pool)
Increase the diameter or length of the pipes; another option is to replace pipes with 90-degree bends with 45-degree bends or flexible pipework. By reducing hydraulic resistance, you can reduce pumping energy consumption by up to 40%.
Some basic calculations to help you choose the optimal swimming pool pump.
First, you need to calculate the pool capacity using the formulas below.
The optimal pump performance stated in m3, together with the information at what pressure losses this performance is achieved, is very important, because there is no uniform way of stating pump performance and it is often compared inconsistently. For optimal operation, the pipework, bends, etc. must be designed correctly. See the section on saving money when using a pump.
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