how often to change cartridge pool filter


Author: Poolking - Swimming Pool Equipment Manufacturer


A pool filter cartridge is an essential component of an effective pool maintenance system. Its responsibility is to capture debris, dirt, and even bacteria from the water to prevent them from circulating in the pool. Therefore, it's important to know how often to change a pool filter cartridge to ensure the pool stays clean and healthy for swimmers.

Frequency of Use

The frequency of use is a key factor in determining how often you should change your pool filter cartridge. If you use your pool frequently, then the cartridge will have a shorter lifespan. Therefore, it is recommended that you change the cartridge every four to six months if you use the pool on a frequent basis.

Water Balance

Another key factor in determining how often you should change your pool filter cartridge is the water balance. If the water balance is not properly maintained, the cartridge may become clogged faster, meaning it will need to be replaced sooner. Therefore, you must ensure that you regularly check and maintain the pH and chlorine levels in your pool to keep the water balance in check.

Pool Size

The size of the pool is also another factor that can influence how often you should change your pool filter cartridge. If you have a large pool, then it will require a larger cartridge, which means it will take longer to fill up and therefore last longer. Conversely, if you have a smaller pool, then it will require a smaller cartridge, which means it will need to be changed more frequently.

Type of Cartridge

The type of cartridge you use can also affect how often you should change it. There are two main types of pool filters: sand and cartridge. Cartridge filters are more efficient and can catch smaller particles than sand filters, which means they can last longer. However, they are also more expensive to replace. Therefore, it is crucial to consider both efficiency and cost before deciding which type of filter to use.

When to Inspect

It's important to keep an eye on the cartridge filter and inspect it regularly. When you notice that the water flow rate has slowed down, it is an indicator that the cartridge needs to be replaced. This can usually occur between four to six months of use, depending on the factors listed above.


The frequency of changing the pool filter cartridge depends on several factors such as frequency of use, water balance, pool size, and the type of cartridge being used. It's important to keep these factors in mind to ensure that the cartridge is changed regularly and the pool stays clean and healthy. Remember to inspect your cartridge regularly and change it once it has reached its lifespan to keep your pool in tip-top shape.


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