Internal core rigidity and exact end-cap dimensions separate a dependable filter cartridge from one that buckles mid-season, and they matter far more than advertised square footage. Inground pumps push water with serious force. When a replacement element lacks reinforced center support or misses the housing height by even a fraction of an inch, the pleats quickly flatten against each other. That structural failure lets dirty water bypass the filter entirely, while triggering rapid pressure spikes that strain pool equipment. Instead of enjoying a clean swim, pool owners lose entire weekends wrestling off heavy tank lids, hosing down slimy pleats, and wondering why the deep end remains stubbornly hazy.
Getting the setup right means water stays sparkling without constant maintenance headaches. To lock in stable water pressure all season, measure the physical length, outer diameter, and core opening on your existing unit before ordering, rather than relying on generic size labels. Check for reinforced inner cores and glued support bands that keep pleats evenly spaced under intense circulation, and confirm whether you need individual replacement elements or a complete filter system. Below are the dependable options built to seat tightly in inground housings, resist intense pump pressure, and keep your water clear with minimal rinsing.
425 Sq Ft Quad Cartridge Filter- a filter with a simple operating system and maintenance patented technology4x the cleaning capacity of most element filters- longer running cycles compared to standard cartridge filtersCompatible with single-speed and variable-speed pumpsHD-4 all resin tank won't cor
Key specs
- Filter System Type
- Complete 425 sq ft quad tank assembly
- Tank Construction
- Molded from heavy-duty HD-4 all-resin material designed to resist outdoor weathering and chemical corrosion without rusting.
Pros:
- Complete 425 sq ft tank assembly delivers high debris capacity for large pool systems
- Corrosion-resistant HD-4 resin tank stands up to harsh outdoor pool pad conditions
- Cartridges include integrated support banding to prevent pleat collapse under flow
- Compatible with both single-speed and energy-saving variable-speed pool pumps
Cons:
- Full tank unit requires complete plumbing installation rather than a simple element swap
- Large 39-inch height and 23.5-inch footprint demands ample equipment pad clearance
Made in USA with high quality filtration media that was made specifically for durability and cleanability. Includes support bands around each cartridge element.Pentair CCP420 Cartridge Filter (PN 160301), Waterway Crystal Water 105 SQFT (817-0106), 420SQFT Jacuzzi J-CQ420 JCF425 Cartridge Filters (P
Key specs
- Filtration Media
- Uses 100 percent Reemay spunbond fabric with perimeter support bands to maintain uniform water flow and simplify hose rinsing.
- OEM Cross-Reference
- Replaces Pentair CCP420 part 160301 and 178584
- Replaces Unicel C-7471 and Pleatco PCC105-PAK4
- Replaces Waterway 817-0106 and Filbur FC-1977
Pros:
- Constructed with American-made Reemay filtration fabric for rugged pleat longevity
- Engineered support bands keep pleats evenly spaced during high pump pressure
- Matches Clean & Clear Plus 420 specifications with exact 26-1/16 inch length
- Standard 3-inch openings and 7-inch outer diameter ensure a secure manifold seal
Cons:
- Requires purchasing a full four-pack even if only one element is damaged
- Plumbing unions and housing O-rings must be sourced separately
➤SPECIFICATIONS: Length: 26"; Outside Diameter: 7"; Top Opening: 3"; Bottom Opening: 3"; Material Area: 105 Sq.ft; Filter Material: Trilobal Filtration Fabric.➤COMPATIBLE MODELS: PLF105A Pool Filter compatible Pentair CCP420, 160301, Waterway Crystal Water 425, 570-0425, SD-00163, AK-60431, Aladdin
Key specs
- Media Technology
- Features trilobal filtration fabric designed to lock in fine grit while releasing buildup cleanly when sprayed with a garden hose.
- Safety Certification
- IAPMO certified to NSF/ANSI 50 standards
Pros:
- Certified by IAPMO to NSF/ANSI 50 standards for non-toxic material safety
- Trilobal fiber structure expands surface area to trap fine silt and organic debris
- Standard 26-inch length and 3-inch top and bottom holes ensure drop-in fit
- Pleats release trapped debris rapidly during hose washdowns to cut cleaning time
Cons:
- Aftermarket replacement elements do not include tank manifold or air relief parts
- Only fits 420-sized quad housings and cannot fit 320 or 520 filter tanks
【NSF/ANSI 50 CERTIFIED】 TOREAD Pool and Spa filter is tested and certified by IAPMO against NSF/ANSI 50. The filter with certified safe materials provides you with clean, fresh and clear water. Only select certified filters for your family to ensure the safety, health and happiness of your loved one
Key specs
- Structural Reinforcement
- Built with heavy-duty end caps resistant to pool chemicals and a reinforced center core to keep the cylinder rigid under powerful pump flow.
- Safety Certification
- IAPMO certified to NSF/ANSI 50 standards
Pros:
- Certified by IAPMO to NSF/ANSI 50 material safety standards
- Features 25 percent thicker fabric designed to resist tearing under high pressure
- Chlorine-resistant end caps and reinforced core resist cracking from chemical exposure
- Trilobal pleats increase dirt collection capacity without restricting water flow
Cons:
- Pack of four is designed exclusively for 420 sq ft cluster setups
- Requires monthly hose rinsing to maintain optimal flow rates through the thicker fabric
【Perfect Match】Compatible with Pentair Clean & Clear Plus 420/160301/178584 pool filter. Replacement for Pentair R173576, R173476, Pleatco PCC105/PCC105-PAK4, Unicel C-7471/C-7471RA, Filbur FC-1977/FC-1977P, Pure N Clean PC-1977/PC-1977P/PC-6470 and more. All manufacturers' names and part numbers ar
Key specs
- Core Durability
- Spunbond polyester media surrounds an engineered center core that withstands high-flow water pressure without buckling.
- Housing Fitment
- Fits Pentair Clean & Clear Plus 420 housings
- Fits Waterway Crystal Water 425 filters
- Direct replacement for Unicel C-7471 and Filbur FC-1977
Pros:
- Certified by NSF International against NSF/ANSI 50 material standards
- Sturdy inner core and spunbond polyester hold pleat alignment against pump surges
- Trilobal pleat design distributes debris evenly across all 420 square feet
- Exact 26-inch by 7-inch sizing with 3-inch cores matches OEM specifications
Cons:
- Does not include replacement tank lid O-rings or internal guide rods
- Manufacturer recommends monthly cleanings to prevent pressure rise from oil accumulation
✅ REPLACEMENT FILTER - Get purer, cleaner water in your pool or spa with these replacement cartridge filters compatible for Pleatco PCC80, Unicel C-7470, Filbur FC-1976. Used in pools and spas made by American Products, Fox Wal-Pak, Pac Fab, Pentair Pool Products, Waterway Plastics and other manufac
Key specs
- Element Dimensions
- Length: 19 7/8 inches (19.875 inches)
- Outside diameter: 7 inches
- Core openings: 3 inches top and bottom
- Target Compatibility
- Directly replaces Pleatco PCC80, Unicel C-7470, and Filbur FC-1976 elements used in Pac Fab, American Products, and Pentair housings.
Pros:
- Exact 19 7/8 inch height fits shorter 320 sq ft quad cartridge filter housings
- True 3-inch top and bottom core holes slide directly onto standard internal manifolds
- Provides 320 sq ft of total filtration across four 80 sq ft replacement elements
- Pleated fabric releases dirt quickly during washdowns to shorten maintenance chores
Cons:
- Incompatible with standard 26-inch Clean & Clear Plus 420 filter housings
- Four-pack bundle does not include replacement manifold spacers or seals
ECONOMICAL PERFORMANCE: The Hayward SwimClear 325 sq. ft. pool filter provides excellent filtration and hydraulic performance for reduced cost of operationNO BACKWASHING REQUIRED: Cleanable cartridge elements eliminate the need for backwashingDURABLE DESIGN: Filter tanks are made from the most durab
Key specs
- Filter System Type
- Complete 325 sq ft quad cartridge tank
- Tank Security
- Heavy-duty one-piece clamp fastens top and bottom tank halves securely while letting you open the housing quickly for cartridge rinsing.
- Warranty Coverage
- 3-Year manufacturer warranty
Pros:
- Substantial 325 sq ft filtration area delivers extended cycles between cleanings
- Tamper-proof single-piece flange clamp allows secure and fast access to cartridges
- Durable tank construction withstands harsh exterior conditions and high system pressures
- Eliminates backwashing requirements to save treated pool water and chemicals
Cons:
- Heavy 74.8-pound tank assembly requires complete plumbing installation
- Substantially larger initial investment than purchasing replacement cartridge sets
HIGH POWERED - These high-powered, rugged filter systems are constructed of tough weather resistant and corrosion proof polymer. The systems are powered by high powered pumps that are energy efficient, allowing you to run your pump less while maintaining crystal clear water.FILTER CARTRIDGE INCLUDED
Key specs
- Capacity Rating
- Inground pools up to 35,000 gallons
- Single Cartridge Design
- Uses one large internal element inside a corrosion-proof polymer tank, eliminating the need to align multi-cartridge top manifolds.
Pros:
- Rated to manage water turnover for inground pools up to 35,000 gallons
- Rugged polymer tank body provides corrosion proof durability in any weather
- Complete setup comes with the primary filter cartridge element included
- Single extra-large cartridge simplifies maintenance down to one element to rinse
Cons:
- Single large element can be heavier and bulkier to hose clean than smaller quad sets
- Plumbing connections and specific pipe sizes must be confirmed prior to install
THE PERFECT MONEY SAVING REPLACEMENT FILTER FOR OTHER, MORE EXPENSIVE "BULLET" SHAPED CARTRIDGE FILTERS!Crafted from extra-durable, glass reinforced, corrosion-resistant co-polymer material that meets the demands of even the toughest applications.Large filter area offers greater efficiency and dirt
Key specs
- Plumbing Flexibility
- Features 2-inch female pipe connections that can be adapted down to 1.5 inches to fit standard inground filter pad plumbing.
- Tank Profile
- 14-inch base circumference bullet design
Pros:
- Glass-reinforced copolymer construction resists high pressure and chemical wear
- Includes 2-inch female plumbing connections that easily reduce down to 1.5 inches
- Compact 14-inch base circumference fits tight bullet-shaped filter footprints
- Wider top design expands filtration surface area and maximizes internal flow
Cons:
- At 120 sq ft it offers less surface area than large quad-element systems
- Will require more frequent rinse cycles on pools with heavy bather or leaf loads
Polyester Filter Cartridge: The high-density polyester filter cartridge with 24 m³/h maximum water flow, not easily deformed and convenient to backwash for reuse, can absorb grease, filter dust, block leaves, and hairs, and eliminate odors effectively. Note: Regular cleaning can extend the cartridge
Key specs
- Pressure Management
- Integrated gauge lets you monitor tank pressure, while an automatic air relief valve expels trapped air to keep internal pressure balanced.
- Flow Capacity
- 24 cubic meters per hour maximum water flow
Pros:
- Includes an automatic pressure relief valve and integrated pressure gauge
- Thread-free ring lock cover enables quick lid removal without wrestling hardware
- Glass-fiber polypropylene body provides sturdy corrosion-proof housing durability
- Comes complete with 2 plumbing unions to simplify installation on the equipment pad
Cons:
- 150 sq ft single cartridge requires frequent rinsing on large inground setups
- Dual inlet layout requires plugging the unused port with the included plug
Last update on 2026-10-08 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API
How do I verify if a replacement cartridge will fit my inground pool filter?
Check the exact physical dimensions and part numbers of your current elements before purchasing a replacement. Inground multi-cartridge systems like the Pentair Clean & Clear Plus 420 use elements measuring 26 inches in length, 7 inches in outside diameter, and feature 3-inch top and bottom open holes. Other systems, like those matching the Pleatco PCC80 or Unicel C-7470, require elements measuring 19 7/8 inches long with a 7-inch diameter and 3-inch openings. Confirm the part number on your tank or cartridge end cap, such as 160301 or 817-0106, to ensure a snug seat that prevents dirty water from bypassing the pleats.
Should I replace individual cartridge elements or purchase a complete filter tank?
Replace the individual cartridge elements if your existing tank body and manifold remain in sound structural condition. Swapping out worn elements fixes common issues like torn pleats, bypass, or rising pressure without the added labor of replumbing your equipment pad. A complete assembly, such as the 325-square-foot Hayward SwimClear or an Rx Clear filter rated for pools up to 35,000 gallons, is only necessary if your current tank housing is cracked, leaking around the clamp seam, or structurally damaged.
How can I prevent pool filter cartridge pleats from flattening or tearing under pump pressure?
Select replacement cartridges constructed with heavy-duty filter media and integrated pleat support bands. Cartridges made with 100% Reemay media or trilobal filtration fabric resist collapsing when exposed to powerful inground pump flow. Outer support bands wrapped around the elements hold the pleat spacing uniform, which prevents the folds from flattening against the center core and splitting under high water velocity.
What square footage does an inground pool cartridge filter need?
Match the filter area to your pool volume and pump requirements, with inground systems typically spanning from 120 square feet up to 425 square feet. While smaller standalone setups might only require a compact filter for a 5,000-gallon pool, inground installations demand significantly more surface area to manage continuous debris loads. Single-element systems provide 120 or 150 square feet, while quad-cartridge configurations combine four 105-square-foot elements for 420 square feet of total media to maintain steady circulation pressure.
Do inground cartridge pool filters require backwashing?
No, cartridge pool filters eliminate the backwashing process entirely by using removable elements that you clean manually. Unlike a diatomaceous earth pool filter that requires regular backwash cycles and powder recharging, cartridge filters capture debris directly in cleanable pleats. Systems like the 325-square-foot Hayward SwimClear run without backwash valves, which saves pool water and prevents treated water from being flushed away.
What safety certifications ensure replacement cartridge materials hold up in pool water?
Look for replacement cartridges certified by IAPMO or NSF International against NSF/ANSI 50 standards. This standard confirms that the cartridge media, end caps, and adhesives are certified safe and durable for swimming pool water. Certified cartridges ensure the trilobal or polyester materials resist degradation from pool chemicals and continuous water circulation without breaking down over time.
