If your pool has a cartridge filter, you’re already enjoying one of the most convenient and efficient filtration systems available. Cartridge filters are known for providing superior water clarity without the need for messy backwashing, and they use less water than sand or DE filters.

Like any pool equipment, though, they need regular maintenance to stay in top shape. Here’s how to properly care for your cartridge filter and keep your pool sparkling clean all season long.
   

What Does a Cartridge Filter Do?  

A cartridge filter uses pleated polyester fabric to trap dirt, debris, and even fine particles like sunscreen and pollen. Water flows through the filter, gets cleaned, and then returns to your pool.

Because they capture finer particles than sand filters, cartridge filters can keep your water looking crystal clear with proper care.


Essential Cartridge Filter Maintenance  

1. Monitor the Pressure Gauge  

The pressure gauge on top of your filter is your best maintenance indicator.

• Normal Pressure: Record this number after a fresh cleaning.
• Time to Clean: When pressure rises 8–10 PSI above the starting pressure.

1. Turn off the pool pump.
2. Block off the water flow using expandable plugs or shut-off valves
3. Open the filter housing and carefully remove the cartridge.
4. Spray the pleats with a garden hose (low to medium pressure) from top to bottom.

Reassemble the filter and restart the pump.

Tip: Rinse cartridges every 2–6 weeks, depending on pool use, weather, and debris.
  
3. Deep Clean Periodically  

Even with regular rinsing, oils, sunscreen, and minerals can build up in the fabric.

Use a Filter Cleaner:  

  1. Soak the cartridge in a commercial filter cleaner or a mild dish soap solution.
  2. Rinse thoroughly before reinstalling.

Frequency: Deep clean at least once or twice per season for best results.

4. Replace Cartridges When Needed  

A cartridge won’t last forever. Over time, the pleats lose their shape, and the fabric wears out.

Lifespan: Typically 2–3 years, depending on care and pool conditions.

Signs It’s Time to Replace:  

    Persistent cloudy water
    Cracked end caps or fraying fabric
    Needing more frequent cleanings to maintain flow


5. Winterize If Necessary  

If you live in a freeze zone:

1. Remove the cartridge and store it indoors to avoid cracking.
2. Drain all water from the filter tank.
3. Leave the filter housing dry and open until spring.

Why Proper Cartridge Filter Care Matters  

Keeping your cartridge filter in good condition:

  Maintains sparkling water  
  Reduces strain on your pump and heater
  Saves money by extending cartridge lifespan

Neglecting it, on the other hand, can lead to clogging, cloudy water, and costly equipment repairs.

Final Tip: Stay Consistent  

Check your pressure gauge weekly, rinse your cartridges as needed, and plan seasonal deep cleanings. A little routine care goes a long way toward worry-free pool ownership.