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how often swimming pool water change


Author: Poolking - Swimming Pool Equipment Manufacturer

Swimming pools are an excellent source of entertainment and relaxation. However, just like any other amenity, it requires regular maintenance to stay in optimal condition. One essential aspect of maintaining a healthy swimming pool is water replacement. But how often should one change the swimming pool water? In this article, we will give you comprehensive information about pool water maintenance and the frequency of pool water changes.

Why Should You Change Your Swimming Pool Water?

Swimming pool water is continually exposed to various elements like dust, debris, and algae that can make it dirty and contaminated after a while. Additionally, exposure to sunlight, high winds, and heavy rains can affect the water chemistry, reducing its efficiency at sanitizing the pool properly.

Furthermore, constant use of the pool by humans, pets, and other animals can introduce various oils, sweat, dead skin cells, hair, and other contaminants into the water. This can lead to a build-up of bacteria and other microorganisms that can damage pool filters and equipment if left unattended. Also, chlorine and other chemicals used to keep the pool sanitized do not last forever; thus, they need to be replenished regularly.

Therefore, only changing your pool water, exclusive of cleaning and other maintenance procedures, is not a complete solution for keeping your swimming pool clean and healthy - it is, however, an important part of keeping it in optimal condition.

How Often Should You Change Your Pool Water?

There is no standard answer to this question because the frequency of a pool water change depends on various factors like the size of the pool, the water temperature, and the bather load. However, based on the factors mentioned above, below is a general guideline to help determine when to change your pool water:

1. Bather Load

An area with high bather load like a public pool or a private pool hosting pool parties will require frequent pool water changes than a private residential pool of the same size. This is because of the number of people using the pool. Therefore, if your pool gets high bather load, you will need to change the water more often.

2. Water Chemistry

Water chemistry is a crucial factor to consider because it affects the effectiveness of sanitation chemicals in the swimming pool. If the water chemistry is not balanced, it can lead to the multiplication of bacteria, algae, and other microorganisms that can harm the pool users. Keep an eye on the pH, alkalinity, and calcium hardness levels to avoid compromising the water chemistry. If the levels are regularly off, it might indicate that you need to change the water.

3. Water Temperature

Cold swimming pool water can last longer than warm water because warm water encourages bacteria and other microorganisms to grow. It is advisable that when the water temperature is close to 80 ℉ or if you have a heated swimming pool, you should change the water once a year.

4. Pool Size

The size of the pool also matters when determining when to change the water. Based on the above guidelines, a smaller pool should undergo water changes more often than a larger one. While it might not be extremely important if you have a large pool, it is highly recommended to avoid using the same water year after year.

5. Chemical Levels

If you've tried all the other factors and can't seem to balance out your swimming pool chemistry, this might be a sign that it's time to change the pool water.


Regularly monitoring the swimming pool is critical to maintaining proper pool chemistry and healthy water conditions. We hope that we have provided you with informative guidelines for when to change your pool water. If you practice this routine pool maintenance, your pool will always be in optimal condition, and you'll have a fantastic time swimming with your family and friends.


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