How to Clean a Pool Filter Cartridge Properly

Why Cartridge Filter Cleaning Matters

Your pool filter cartridge plays a major role in keeping your water clear and free of contaminants. When it becomes clogged with dirt, oils, sunscreen, or debris, your pool can quickly become cloudy and your circulation system has to work harder than it should.

Proper cartridge cleaning not only helps maintain clear water but also extends the life of your filter and prevents unnecessary strain on your pump. This guide walks you through the correct steps for cleaning a pool cartridge filter safely and effectively—without damaging the filter or your equipment.

Step 1: Turn Off the Pump and Release Pressure

Before doing anything else, shut off your pool pump. Slowly open the air-relief valve to release built-up pressure inside the filter tank. This prevents sudden bursts of water and keeps the system safe to work on.

Step 2: Open the Filter Housing

Remove the filter lid or clamp assembly. Your owner’s manual will help guide you on the exact steps for your specific model. Carefully lift off the top to access the cartridges inside.

Step 3: Remove and Inspect Each Cartridge

Take each cartridge out one at a time and check for:

Tears
Cracks
Worn ends
Flattened or damaged pleats

Set the cartridges aside somewhere clean and dry while you prepare to wash them.

Step 4: Rinse the Cartridges Thoroughly

Use a garden hose with a spray nozzle to rinse between every pleat. Spray from top to bottom, making sure you flush out dirt, sand, algae, and debris lodged deep in the folds.

Tip: A slower, more controlled spray is better—high pressure can damage the pleats.

Step 5: Deep Clean for Oils and Heavy Buildup

If the cartridge is greasy, slimy, or coated in sunscreen residue, a simple rinse isn’t enough.

Soak the cartridge for at least 6 hours in Natural Chemistry Filter Perfect, making sure to follow product directions. This solutions break down oils and organics that clog the pleats.

Do not use vinegar or household bleach. These may seem cheaper, but they are less effective and can damage the filter material over time.

After soaking, rinse thoroughly again to remove all cleaner residue.

Step 6: Reassemble the Filter

Place the clean cartridges back into the housing and ensure they are seated correctly. Replace the filter lid or clamp and tighten according to your manufacturer’s instructions.

Step 7: Inspect the O-Ring

Check the main O-ring for cracks, flattening, or brittleness. If it’s worn, replace it before running the system again.

Step 8: Restart the System and Bleed Air

Turn the pump back on and open the air-relief valve again. Once a strong, steady stream of water flows out, close the valve. This ensures proper pressure and removes trapped air from the system.

Step 9: Check the Pressure Gauge

Your pressure gauge should return to its normal operating PSI.
If the pressure is unusually high or low:

The filter may not be assembled correctly
Cartridges may be damaged or not seated properly
A seal may be out of place

Tip: Note the starting PSI after cleaning the filter. When PSI increases 10 PSI over starting, it’s time to clean your filter out again.

Correct any issues immediately to avoid pump strain.

How Often Should You Clean a Pool Cartridge Filter?

There’s no one-size-fits-all schedule—it depends on your pool’s conditions.

Clean your cartridge when:

The pressure gauge is 8–10 PSI above the clean starting pressure
Water flow decreases
The water starts to look dull or hazy
There has been heavy debris, storms, or high pool usage

Keeping an eye on your pressure gauge is the most reliable way to know when it’s time to clean.

How Long Do Pool Filter Cartridges Last?

With proper care, cartridge filters can last 3–5 years. However, they may wear out sooner if:

You clean them improperly
They are exposed to high levels of oils or debris
They are aftermarket (not recommended)
Your pump is oversized for the filter

Signs your cartridge needs replacement:

Water stays cloudy even with proper chemistry
PSI rises quickly after cleaning
You’re cleaning it far more often than usual
Visible tears, fraying, or deformities

Can You Clean a Pool Filter Cartridge With Vinegar or Bleach?

Many DIY sites suggest vinegar or household bleach, but these are not recommended.

Why not vinegar?

Not strong enough to remove oils
Can damage filter material over time

Why not bleach?

Breaks down the fibers in the pleats
Leaves harmful residues
Shortens cartridge lifespan

Always use pool-specific filter cleaning solutions for safe, effective maintenance.

Keep Your Filter Clean for Clear, Healthy Water

A clean cartridge filter is essential for optimal water clarity and efficient circulation. With regular rinsing, occasional deep cleaning, and proper cartridge care, your pool will run more smoothly and stay cleaner throughout the season.

If you’re unsure whether your filter needs cleaning or replacing, bring your water sample to Mock Pools & Ponds. Our team can test your water, inspect your equipment, and recommend the right products to keep your filtration system running at peak performance.

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