Best Seller Hot Deal

Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607

CPF-3710
Best Seller Hot Deal

Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607

CPF-3710
$29.99
($29.99 / count)
$46.99
You Save $17.00 (-36%)
Pack Size: 1 Pack
Diameter
4 5/8"
Length
8"
Filtration Area
19 Sq. Ft.
Top
Handle
Bottom
1 1/2" MPT Threaded
Features
Antimicrobial Protection
View all specifications
About this item
  • Antimicrobial media helps reduce odors caused by buildup
  • Captures dirt, debris, bugs, organics, fine particles, and more
  • DiamondCore™ Technology boosts flow and reduces clogs
  • Reusable design rinses clean in seconds
  • Engineered for durability and long-lasting performance
  • Protects your pump, system, and equipment
  • NSF/ANSI 50 Certified for safe, reliable filtration
See more details
Compatibility
Filbur
FC-0121
Pleatco
PTL18, PTL18P4, PTL18-XP, PTL18-4
Unicel
4CH-21
OEM
AK-9003,11901, CH19, SD-00001, SD-00821, SD-00838, SD-00845
View compatibility
One-Time Purchase
$29.99 ($29.99 / count)
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Ships in 1-2 Business Days
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(2999 / count)
Save 15% on your first order and 10% on repeat deliveries.
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Keep your pool water crystal clear and ready for whatever summer throws your way with the Clarus® CPF-3710 Replacement Filter Cartridge. Built to capture the gunk that clogs flow and clouds water such as dirt, sand, leaves, hair, oils, pollen, and other fine debris—before it messes with your circulation (and your swim time). This filter delivers serious cleaning power with washable, reusable performance that keeps your pool sparkling and swim-ready. Because murky pool water just isn’t an option.

  • High-Efficiency, Bigger Results: ProGrade™ pleated media captures everything from fine sand and dust to leaves and body oils, keeping water balanced, clean, and swim-ready.
  • Built-In Defense: Antimicrobial protection blocks bacteria, mold, and odor-causing buildup on the filter surface, so it stays fresher between cleanings.
  • Stronger Flow, Less Stress: DiamondCore™ Technology improves circulation and prevents clogging to protect your pump and extend equipment life.
  • Rinse, Reset, Repeat: The durable, reusable design rinses clean in seconds—no tools, no hassle. Rinse every 1–2 weeks and replace every 2–4 weeks depending on use, or sooner if pleats are damaged or performance won’t return after cleaning.
  • Made to Last (Like Your Summer): Reinforced end caps and media resist pressure, backflow, and wear—even after repeated cleanings.
  • Protect What Powers Your Pool: Shields your pump and filtration system from debris that causes strain, ensuring smoother performance all season long.
  • Peace of Mind: NSF/ANSI 50 Certified for safe, high-performance filtration that keeps your water clear and your swim days uninterrupted.
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Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607
Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607
from $29.99
(Current Model)
Clarus 4-5/8" x 8" Pool & Spa Replacement Filter Cartridge – Replaces FC-0121, 4CH-21, PTL18
Clarus 4-5/8" x 8" Pool & Spa Replacement Filter Cartridge – Replaces FC-0121, 4CH-21, PTL18
from $46.99
Learn More
Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607 (4 Pack)
Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607 (4 Pack)
from $46.99
Learn More
Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607 (2 Pack))
Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607 (2 Pack))
from $46.99
Learn More
Test
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Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607
Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607
from $29.99
(Current Model)
Clarus 4-5/8" x 8" Pool & Spa Replacement Filter Cartridge – Replaces FC-0121, 4CH-21, PTL18
Clarus 4-5/8" x 8" Pool & Spa Replacement Filter Cartridge – Replaces FC-0121, 4CH-21, PTL18
from $46.99
Learn More
Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607 (4 Pack)
Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607 (4 Pack)
from $46.99
Learn More
Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607 (2 Pack))
Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607 (2 Pack))
from $46.99
Learn More
Test
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Find Your Best Fit !

Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607
Clarus 4-1/4" x 8" Pool Filter Cartridge – Replaces Intex Type A/C/III, Pleatco PC7-120, Unicel C-4606, C-4607
$29.99
Shop Now
Clarus 3-in-1 Pool & Spa Water Test Kit for pH, Total Chlorine and Bromine
Clarus 3-in-1 Pool & Spa Water Test Kit for pH, Total Chlorine and Bromine
$49.99
Shop Now
Clarus 7-in-1 Pool & Spa Water Quality Test Strips – Total & Free Chlorine, Total Bromine, pH, Total Alkalinity, Hardness, Cyanuric Acid, 100 Count
Clarus 7-in-1 Pool & Spa Water Quality Test Strips – Total & Free Chlorine, Total Bromine, pH, Total Alkalinity, Hardness, Cyanuric Acid, 100 Count
$46.99
Shop Now
3-4'8
4-5'8'
5-4'8'
Technical Details
SKUCPF-3710
Filter Dimensions4-1/4" L x 8" D
Outside Dimensions4- 1/4"
Length8"
Top Hole1-15/16"
Bottom Hole1-15/16"
Top StyleOpen
Bottom StyleOpen
Filter MediaPleated Polyester
Media Weight3
MaterialPolyester media, Polypropylene end caps & core
Micron Rating20
Filter Life (months)1 month
Contaminants Reduced Sediment
Rust
Debris
Leaves
Insects
Hair
Algae
Dirt
Sand
Pollen
Bacteria
Mold
Mildew
Fungi
Biofilm
Organic Waste
Microscopic Parasites
Dust
Fine Particles
and Odor-Causing Microbes
Filter TypeCartridge
Installation TypeDrop In
Filter CoreDiamondCore™
Warranty / Certifications
CertificationsNSF 50
Warranty1 Year Warranty*
Additional Resources
How do I know if this filter fits my pool?
Toggle Icon

If your filter cartridge is 8” tall with a 4 1/4” outer diameter and a 1 15⁄16” Open on both ends, there’s a good chance this is a match. For fast confirmation, use the compatibility search tool above.

How often should I clean and replace this filter?
Toggle Icon

For best performance:

  • Rinse: Every 1–2 weeks (or sooner with heavy debris/use)
  • Replace: Every 2–4 weeks depending on use – sooner if performance doesn’t recover or pleats are damaged
  • Clean sooner if filter pressure rises ~8–10 PSI over clean pressure
  • Deep clean (soak): Optional as needed (monthly if you’re trying to stretch life a bit)

Signs it’s time to replace:

  • Reduced flow even after deep cleaning
  • Rising pressure that doesn’t improve after cleaning
  • Frayed, crushed, or flattened pleats
  • Cracked/damaged end caps
What does antimicrobial protection do?
Toggle Icon

Antimicrobial protection is built into the filter media to help keep the cartridge fresher between cleanings and reduce buildup over time. It doesn’t replace proper water chemistry or regular cleaning.

Is the Clarus CPF-3710 washable?
Toggle Icon

Absolutely. The ProGrade™ pleated media is designed for repeated use. Simply rinse the pleats thoroughly with a garden hose, spraying between pleats to remove trapped debris. For deep cleaning, soak the cartridge in a cartridge filter cleaning solution, then rinse completely before reinstalling. Let it dry if your cleaner recommends it.

Is this filter certified?
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Yes. The CPF-3710 is certified to NSF/ANSI 50 standards for safety and performance in pool & spa filtration.

Does this filter reduce chemical use in my pool?
Toggle Icon

It can. By capturing more debris and contaminants before they circulate, this filter helps maintain water balance longer, reducing the need for frequent chemical adjustments. Cleaner water also helps your sanitizer work more efficiently, so you use less overall.

How will this filter protect my pump?
Toggle Icon

DiamondCore™ Technology improves water flow and resists clogging, reducing strain on your pump and helping it run cooler, quieter, and longer.

What is this filter made of?
Toggle Icon

It features reinforced ProGrade™ pleated media and a high-strength DiamondCore™ built to withstand pressure, backflow, and heavy-duty use without collapsing or cracking under strain.

Can I use this with Intex or Bestway systems?
Toggle Icon

Yes, it’s compatible with most Intex Type A, C, and III filter systems as well as Bestway Flowclear models. To confirm your fit, check the model number using the compatibility tool above.

Why choose Clarus over other filter brands?
Toggle Icon

Clarus filters are built for performance, not shortcuts. We use premium ProGrade™ pleated media, a reinforced core built to hold shape under pressure, and antimicrobial-treated filtration media to help keep the cartridge fresher between cleanings. Translation: stronger flow, better debris capture, and durability you can actually feel so you spend less time swapping filters and more time enjoying clear water.

And for extra peace of mind, Clarus filters are NSF/ANSI 50 certified, meaning they meet recognized industry standards for safety and performance in pool and spa filtration, so you can trust the filtration doing its job, day after day.

Still not sure? Chat with a Clarus expert or visit our Help Center.