How to Replace a Pool Filter Cartridge?Updated a month ago

Replacing your pool filter cartridge is a simple but critical task to keep your water clear and your system running efficiently. Here’s how to swap out old cartridges the right way—no stress, no mess.

Tools You’ll Need

• Replacement cartridge (check your filter’s model number). Browse our pool filter cartridge collection which has an easy-to-use quiz.

• Silicone lubricant or O-ring grease.

• Garden hose with spray nozzle.

• Soft brush (nylon bristles).

• Rubber mallet (optional, for stubborn lids).

Step-by-Step Replacement Guide

1. Turn Off the Pump

• Shut off power at the circuit breaker (safety first!).

• Close skimmer and main drain valves to prevent water backflow.

2. Release Pressure & Open the Filter

• Pull the pressure relief valve on the filter tank until water stops hissing.

• Unscrew the filter tank lid. If stuck, tap gently with a rubber mallet.

3. Remove the Old Cartridge

• Lift out the old cartridge carefully to avoid dislodging debris into the tank.

• Check for cracks, torn pleats, or stiffness (signs it’s time to replace).

4. Clean the Filter Housing

• Hose out the tank interior to remove dirt, bugs, or scale.

• Soak the tank in filter cleaner if there’s heavy buildup.

5. Install the New Cartridge

• Align the new cartridge’s base with the filter’s manifold.

• Ensure it sits evenly and isn’t forced into place.

6. Reassemble & Lubricate

• Clean the tank lid’s O-ring with water, then apply silicone lubricant.

• Screw the lid back on (hand-tighten only—no wrenches!).

7. Restart the System

• Open valves, restore power, and prime the pump.

• Check for leaks and monitor pressure (should return to baseline).

Maintenance Tips for Aussie Pools

• Clean cartridges monthly in summer (hose pleats from top to bottom).

• Replace cartridges every 2–3 years (sooner in dusty or bushfire-prone areas).

• Store spares: Keep an extra cartridge for emergencies.

When to Call a Pro

• Repeated pressure spikes after replacement (possible manifold crack).

• Difficulty removing the lid or aligning cartridges.

• Suspected damage to the filter tank.

Need a New Cartridge?

Browse our Cartridge Filters Collection for replacements compatible with major brands (Astral, Davey, Zodiac). Pair with filter cleaner for peak performance.

Final Tip: Don’t toss old cartridges! Recycle them or keep one as a backup for quick swaps during heavy use. Your pool (and pump) will thank you!