how often should you replace a pool filter cartridge


Author: Poolking - Swimming Pool Equipment Manufacturer

Swimming pools are a great addition to any home, but maintaining them can be a daunting task. One important aspect of pool maintenance is regularly replacing the pool filter cartridge. But how often should you replace it? In this article, we discuss the frequency of pool filter cartridge replacement and provide tips to help prolong the life of your cartridge.

Why is the Filter Cartridge Important?

The pool filter cartridge is responsible for keeping your pool water clean by trapping debris, bacteria, and other contaminants. Over time, the cartridge becomes clogged with buildup and loses its ability to filter effectively. A dirty filter can lead to cloudy water, algae growth, and even health problems for swimmers.

How Often Should the Filter Cartridge be Replaced?

The frequency of filter cartridge replacement depends on a few factors such as pool usage, weather, and maintenance practices. Here are some guidelines to follow:

1. Check the Manufacturer's Recommendations. The manufacturer of your filter cartridge will provide their specific guidelines for replacement in the user manual. These recommendations may differ depending on the brand and model of your filter. Follow the manufacturer’s guidelines for the best results.

2. Evaluate Your Pool Usage. If you have a busy pool with heavy use, you may need to replace the filter cartridge more frequently. This is because increased usage means increased debris and contaminants in the water. On the other hand, if you have a less active pool, you may be able to get away with replacing the cartridge less often.

3. Consider the Weather. If you live in a region with heavy rainfall or windstorms, you may need to replace your cartridge more often. Rain and wind can bring in debris and contaminants that clog up your filter quickly.

4. Check Your Chemical Balance. Proper chemical balance can help extend the life of your filter cartridge. If the pH, alkalinity, and chlorine levels are not properly balanced, it can cause additional buildup on the cartridge and decrease its lifespan.

5. Check the Filter Pressure. Monitor the pressure on your pool filter. If the pressure gauge reads 8-10 psi above the normal reading, it’s time to replace the cartridge. This is because the additional pressure means there is more buildup on the cartridge, making it less effective.

Tips to Prolong the Life of Your Filter Cartridge

Now that you know how often to replace your filter cartridge, here are some tips to help prolong its life:

1. Clean Your Cartridge Regularly. Regularly cleaning your cartridge can prevent buildup and prolong its life. Use a garden hose to clean it every two weeks, or more often if needed.

2. Use Enzyme Products. Enzyme products can help break down oil and other contaminants that are difficult to remove with regular cleaning. These products can help prolong the life of your cartridge by reducing buildup.

3. Maintain Chemical Balance. As mentioned earlier, proper chemical balance can help extend the life of your filter cartridge. Make sure to test your water regularly and adjust the levels accordingly.

4. Schedule Regular Maintenance. It’s a good idea to schedule regular maintenance with a professional pool service. They can inspect your cartridge, clean it, and check the system for any other issues.


In conclusion, the frequency of filter cartridge replacement depends on a few factors such as pool usage, weather, and maintenance practices. Follow the manufacturer’s recommendations, evaluate your pool usage, and monitor the filter pressure to determine when to replace your filter cartridge. Proper cleaning, chemical balance, and regular maintenance can help prolong the life of your cartridge and keep your pool clean and healthy.


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