how often should my pool filter run


Author: Poolking - Swimming Pool Equipment Manufacturer

How Often Should My Pool Filter Run?

Swimming pools provide great opportunities for relaxation, fun, and exercise. However, maintaining a pool requires a bit of work. One critical aspect of pool maintenance is ensuring that the pool filter runs at the right frequency. In this article, we explore the question of how often a pool filter should run, and delve into the reasons behind the recommended frequency.

Understanding Pool Filtration Systems

Before we get into the frequency question, let's briefly examine how a pool filter works. A typical pool filtration system features a pump that circulates water through a filter media. The filter media, which can be in the form of sand, cartridge, or diatomaceous earth, captures impurities such as dirt, leaves, and debris as the water passes through it. Clean water then flows back into the pool through return jets.

The frequency of running the pool filter is essential because the filter system is designed to remove contaminants from the water continuously. When the filter runs for a specified time, it performs a complete turnover, i.e., it pumps and filters all the water in the pool at least once. In other words, running the pool filter for a set duration ensures that the water cycles through the filter system and returns clean, balanced water to the pool.

Factors That Influence How Often You Should Run Your Pool Filter

1) Pool Usage

One of the critical factors to consider when deciding how often to run your pool filter is how frequently the pool is used. The more the pool gets used, the more contaminants it accumulates, such as sweat, sunscreen, and urine, which can compromise water quality. It is, therefore, advisable to run the pool filter slightly more often during peak usage periods like summer, or when a party or gathering is anticipated.

2) Pool Size

The size of the pool is another essential determinant of how often the pool filter should run. A larger pool holds more water, thus more debris and contaminants to be filtered out. A smaller pool, on the other hand, has less water, thus less dirt and debris. For this reason, a larger pool should run for more extended periods and more frequently compared to a smaller one.

3) Climate

The climatic conditions of your area also factor into how often you should run your pool filter. For instance, if you live in an area with hot weather or high winds, more debris and dirt may accumulate in the pool, prompting more frequent filter runs. Conversely, in cooler, calmer weather, the pool may require less filtration.

4) Filter Media Type

The type of filter media your pool uses may also influence the frequency of running the pool filter. Cartridge filters, for instance, are known to trap smaller dirt particles and debris compared to sand filters, which have larger pores. Therefore, cartridge filters may require more frequent running times to trap and filter out as many impurities as possible. On the other hand, sand filters provide longer-lasting filtration, and may not require as frequent runs.

5) Duration of Filtration

Finally, the duration of the filtration process matters. Most experts recommend running the pool filter for around eight hours daily. This duration provides enough time for the pump and filter to cycle all the water through the system at least once in a day. However, some scenarios may call for longer or shorter filtration times, such as when the pool is heavily used, or when there's minimal use.

Importance of Regular Pool Filter Maintenance

While running the pool filter at the right frequency is crucial, it's no guarantee that the pool will remain crystal clear and healthy. Regular maintenance of the pool filter itself is equally important. Experts recommend backwashing the filter at least once a week, brushing the filter regularly to remove debris, and replacing filter media as necessary. These maintenance steps help to ensure that the filter operates at maximum efficiency and traps the most contaminants possible.


In general, the frequency of running the pool filter is dependent on several factors, such as usage patterns, pool size, filter media type, climate, and the duration of the filtration process. As a rule of thumb, most experts recommend running the pool filter for at least eight hours a day. However, it is always a good idea to assess your specific pool's needs and adjust your filter's running frequency accordingly. Additionally, regular filter maintenance is critical to keep the pool water crystal clear and healthy.


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