how often should you replace your pool filter cartridge


Author: Poolking - Swimming Pool Equipment Manufacturer

How Often Should You Replace Your Pool Filter Cartridge?

Pool filters play an essential role in keeping your swimming pool water clean and crystal clear. If you have a pool, then you know how important it is to have a properly functioning filter system. The type of filter you use, whether it’s sand or cartridge, will determine how often you need to replace it. In this article, we will explore how often you should replace your pool filter cartridge and some of the signs that indicate when it’s time to do so.

What is a Pool Cartridge Filter?

A pool cartridge filter is a type of pool filter that uses a pleated polyester fabric cartridge to remove impurities and debris from the pool water. It is a popular choice among pool owners because of its relatively low maintenance requirements and its ability to filter out finer particles than sand filters.

How Does a Pool Cartridge Filter Work?

Water flows through the pool cartridge filter and the pleated fabric of the filter cartridge traps particles and debris that are too small for the naked eye to see. As the filter cartridge becomes clogged with these particles, it reduces the flow of water through the filtration system, resulting in decreased filtration efficiency.

How Often Should You Replace Your Pool Cartridge Filter?

The frequency at which you should replace your pool cartridge filter depends on several factors, including the size of your pool, the volume of swimmers, and the frequency of use. Generally, you should replace your pool cartridge filter every 2-3 years.

Factors That Affect the Lifespan of Your Pool Cartridge Filter

While the standard replacement interval for pool cartridge filters is every 2-3 years, several factors affect the lifespan of your filter cartridge, including:

Frequency of Use - The more frequently you use your pool, the more often you'll need to replace your pool cartridge filter. High usage will cause the filter to clog with debris and reduce its filtration efficiency.

Pool Size - The size of your pool plays a critical role in determining how often you should replace your filter cartridge. Larger pools will require more frequent filter replacements than smaller pools as they have a larger volume of water to filter.

Type of Pool Usage - The type of pool usage affects the lifespan of your pool cartridge filter. For instance, if you frequently entertain guests in your pool, then you'll need to replace the filter more often than if you use it only for personal use.

Water Chemistry - Poor water chemistry can reduce the lifespan of your pool cartridge filter. If your pool water chemistry is off-balance, it can cause excessive wear on the filter and shorten its lifespan.

Signs That Indicate When It's Time to Replace Your Pool Cartridge Filter

As your pool cartridge filter nears the end of its useful life, it will begin to show signs that it needs replacement. The following are some indications that it's time to replace your pool cartridge filter:

Decreased Water Flow - One of the tell-tale signs your filter cartridge is reaching the end of its lifespan is a decreased water flow rate. You'll notice that the water flows slower than usual, indicating that the filter cartridge has become clogged with debris.

Dirty Pool Water - Another sign of a failing filter cartridge is dirty pool water. If your pool water is cloudy, has visible debris or discoloration, it’s time to replace the filter cartridge.

Increased Pressure in the Filtration System - A filter cartridge that has become clogged with debris will cause an increase in pressure in the filtration system. If you notice an increase in pressure, it is recommended to replace the filter cartridge.


Your pool's filtration system is essential in maintaining the overall cleanliness and hygiene of your swimming pool. By understanding when to replace your pool cartridge filter and being mindful of the factors that affect its lifespan, you can ensure your pool stays clean and safe to use for years to come. Remember to replace your pool cartridge filter every couple of years or whenever it shows signs of wear and tear. With proper maintenance, your pool cartridge filter will help keep your pool looking great and feeling inviting.


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