Shop By Type

Find What You Need

Pool and spa cartridges are different. Make sure you're ordering the right type for your application.

Inground & Above Ground

Pool Filter Cartridges

Replacement cartridges for above ground and inground pool filters. Compatible with Hayward, Pentair, Jandy, and all major brands. Poolzilla OEM-compatible cartridges save significantly vs. name brand pricing.

Shop Pool Cartridges

Hot Tub & Spa

Spa Filter Cartridges

Replacement spa and hot tub cartridges for all major spa brands. Spa cartridges are smaller and shaped differently than pool cartridges — verify your model before ordering.

Shop Spa Cartridges

Best Value · Poolzilla Brand

Poolzilla OEM-Compatible

Same filtration specs as the name-brand original — same dimensions, same media, same performance. Cross-referenced to the most popular filter models.

Shop Poolzilla Brand

Most Popular

Best-Selling Replacements

Most customers need one of these. Poolzilla OEM-compatible — same specs, better price. Confirm your filter model matches before ordering.

All Major Brands In Stock

Shop by Brand

We stock OEM cartridges from the top manufacturers and Poolzilla OEM-compatible replacements that cross-reference to their exact part numbers.

Good to Know

OEM vs. OEM-Compatible — what's the difference? OEM is the original brand cartridge (Hayward, Pentair). OEM-Compatible means same specs, same dimensions, same performance — just not the original brand name. Our guide explains exactly when each makes sense.

Before You Order

How to Find Your Exact Match

The wrong cartridge won't seal properly and won't filter effectively. Here's how to confirm you're ordering the right one before you buy.

01

Find Your Filter Model

Look for a label or tag on your filter tank — usually on the side or lid. It will show the manufacturer and model number (e.g. Hayward SwimClear C3030).

Can't find it? Check the owner's manual or look up your filter on the manufacturer's website using the serial number.

02

Check the Cartridge Endcap

Remove your existing cartridge and look at the plastic endcap. You'll find a part number printed or molded into it — that's the fastest way to find your replacement.

Pro tip: Photograph the endcap before you throw out the old cartridge. Makes reordering next season effortless.

03

Measure If Needed

No part number? Measure three things: overall length, outer diameter (OD), and center hole diameter. All three must match exactly for proper fit and sealing.

Still not sure? Call or text us at (732) 395-2225 — we'll identify it for you.

Good to Know

Full cartridge buying guide. Covers how to measure, OEM vs. compatible, when to replace vs. clean, and a complete filter type comparison.

Verify Your Fit

How to Measure

Confirm all three dimensions match your existing cartridge before ordering.

Length

— top endcap to bottom

Outer Diameter

— widest point across

Center Hole

— inside of the hole

Maintenance

When to Replace vs. Clean

Most cartridges should be cleaned every 4–6 weeks and replaced every 1–2 seasons. Here's how to tell the difference.

These Are Normal

Clean It

Pressure gauge reading 8–10 PSI above normal starting pressure

Visible debris or algae — rinse with garden hose top to bottom

Slight discoloration — normal mineral buildup, clean with cartridge cleaner

End of season — clean before storing, store dry

Bands slightly broken — filter still works if pleats are intact

It's Done

Replace It

Pressure stays high even after thorough cleaning

Visible tears, holes, or collapsed pleats in the media

Significant band breakage — pleat spacing is compromised

You've cleaned it 15+ times — media is exhausted

Cartridge is 2+ years old and water clarity is declining

Why Poolzilla Brand

Same Performance. Better Price.

Our OEM-compatible cartridges are manufactured to the same specifications as the name-brand originals — same filtration media, same dimensions, same performance. The difference is the price.

Exact Cross-Reference

Every Poolzilla cartridge lists the OEM part numbers it replaces — Hayward, Pentair, Jandy, Pleatco, Unicel, and Filbur. No guessing.

Same Dimensions

Length, outer diameter, center hole — all matched to OEM spec. Fits the same housing, seals the same way, performs the same way.

Significant Savings

You're paying for filtration performance, not the brand name on the endcap. Same performance at significantly lower cost.

Singles & Multi-Packs

Most cartridges available in single or multi-pack. Buy a spare — cartridges don't expire and you save on shipping.

How do I know which cartridge fits my filter?

The fastest way is to find the part number on the plastic endcap of your existing cartridge. If you can't find it, look up your filter's model number on the tank label and search by model. You can also call or text us at (732) 395-2225 and we'll identify it for you.

Are Poolzilla cartridges as good as Hayward or Pentair originals?

Yes — they're manufactured to the same specifications. Same filtration media, same dimensions, same performance. The difference is you're not paying the brand premium. Every Poolzilla cartridge lists the exact OEM part numbers it replaces so you can verify the match before ordering.

How often should I replace my pool filter cartridge?

Most cartridges last 1–2 seasons with proper care. A good rule of thumb: replace after 15 cleanings, or when pressure stays elevated after a thorough cleaning, or when you see visible damage to the pleated media.

What's the difference between pool cartridges and spa cartridges?

Spa cartridges are physically smaller and shaped differently than pool cartridges. They are not interchangeable. Make sure you're ordering the right type — use the Pool Type tab in our Filter Finder above to filter by pool type.

Do cartridges expire if I buy a spare and store it?

No — pool filter cartridges don't have an expiration date. Store them clean and dry in a cool location and they'll be ready to use whenever you need them. Buying a spare saves you shipping costs and keeps you covered if yours fails mid-season.

Can I clean my cartridge instead of replacing it?

Yes — regular cleaning extends cartridge life significantly. Hose rinse every 4–6 weeks during the season and do a deep soak with cartridge cleaner or a TSP solution twice a season. Replace when the media is visibly damaged, bands are heavily broken, or pressure stays high after cleaning.

Here to Help

Can't Find Your Cartridge?

Give us your filter model or the part number off your old cartridge and we'll find the exact match. We stock 90+ cartridges and can usually ship same day.