How to Backwash a Pool with a Cartridge Filter (The Right Way to Clean It)

Searching how to backwash a pool with a cartridge filter? Here’s the kicker: traditional backwashing isn’t a thing for cartridge systems. They don’t use a multiport valve like sand or D.E. filters. Instead, you’ll pop the cartridge out and clean it the smart way. This guide breaks down how to backwash a pool with a cartridge filter (meaning: clean it correctly), when to do it, and the gear that makes the job quick and painless.

Can You Backwash a Cartridge Filter?

Short answer: no. If you’re wondering can you backwash a cartridge filter, the design simply doesn’t allow it. Cartridge filters trap debris in pleated fabric—no reverse-flow rinse required. If you want to “reset” flow, you manually rinse or soak the cartridge. If you’re upgrading or replacing the tank itself, browse cartridge filter systems for options that match your pool size.

How to Backwash a Pool with a Cartridge Filter (Actual Cleaning Steps)

Here’s how to backwash a pool with a cartridge filter—aka the correct cleaning process. Do this whenever pressure rises ~8–10 PSI above your clean baseline or water clarity drops.

1. Power down & bleed air. Turn off the pump at the breaker. Open the air relief valve until the gauge hits zero.
2. Open the tank. Undo the clamp/band and lift the lid per your model’s manual.
3. Pull the cartridge(s). Grab the handle/top and remove carefully to avoid tearing pleats.
4. Rinse between pleats. Use a garden hose with a fan nozzle—top to bottom, inside to outside. Avoid pressure washers.
5. Deep clean for oils. If sunscreen or fine dust is embedded, soak in a cartridge-safe cleaner per label. (For a fresh set, see this Pentair 4-pack replacement.)
6. Inspect & reassemble. Check for cracked end caps, torn fabric, or collapsed cores. Replace if damaged. Re-seat the element(s), close the tank, and tighten the band evenly.
7. Prime & purge. Restart the pump with the air valve open; when water flows steadily, close the valve and note your clean PSI.

If you want a bigger, lower-maintenance setup that extends time between cleanings, consider a high-capacity four-cartridge tank like the Pentair Clean & Clear Plus 520.

Why This Works Better Than “Backwashing”

• Backwashing wastes thousands of gallons yearly—manual rinsing doesn’t.
• Cartridge pleats catch finer debris than sand, so water looks polished.
• Fewer moving parts: no multiport valve, fewer leaks.

Do You Backwash a Cartridge Filter? (Common Misconceptions)

Lots of owners ask, “do you backwash a cartridge filter?” If by how to backwash a pool with a cartridge filter you mean getting pressure down and flow back up, cleaning is the move. Need parts like O-rings, valve assemblies, or gauges? Check filter parts sized for your brand.

When to Clean vs. When to Replace

Even with perfect care, cartridges wear out. If your how to backwash a pool with a cartridge filter workflow is happening more often, the media may be saturated.

• Clean when PSI climbs 8–10 above clean baseline or clarity dips.
• Replace when pleats stay gunky after soaking, bands crack, or end caps split.

Model-specific life and signs are covered here for Hayward owners: when to replace a Hayward cartridge.

Pro Setups & Upgrades

• Bigger tank, fewer cleanings: A higher square-foot unit (e.g., Waterway 525 sq ft) stretches time between service.
• Keep a spare set: Swap, soak, and let the wet set dry fully—rotating doubles cartridge life. (Sta-Rite owners: PLM100 replacement.)
• Learn your brand’s quirks: See our step-by-step Pentair cleaning guide.

Extra Tips to Make Cleaning Faster

• Log your clean PSI in marker on the tank lid.
• Balance water (especially calcium) to prevent scale on pleats.
• After a big storm or algae cleanup, expect to repeat how to backwash a pool with a cartridge filter steps twice in a week.
• Thinking about switching filter types? Compare options in our filter buying guide.

FAQs: Cartridge Filter “Backwashing”

How often should I clean instead of backwashing?

Typically every 4–6 weeks in season, or when pressure rises 8–10 PSI. For heavy use or lots of pollen, you’ll run how to backwash a pool with a cartridge filter steps more often.

Can I add a backwash valve to a cartridge tank?

No—the hydraulics and internals aren’t designed for it. If you truly want a backwashable setup, you’d switch to sand or D.E. Otherwise, follow how to backwash a pool with a cartridge filter cleaning.

What cleaner should I use for oily buildup?

Use a cartridge-safe soak per label directions. For guidance on care and lifespan, see cartridge maintenance tips.

Is upgrading worth it just to clean less?

Often, yes. A larger square-foot filter slows down PSI rise, so you’ll do the how to backwash a pool with a cartridge filter routine less often. Browse our catalog to match flow rate and pool size.

Crystal-Clear Water Starts with the Right Cartridge Care

Now you know exactly how to backwash a pool with a cartridge filter: you don’t—you clean it. Rinse, soak when needed, and replace on schedule to keep PSI low and water sparkling. Ready to dial in your setup? Visit Aqua Pool Supply for the right tank, cartridges, and parts to make maintenance simple.