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5 Best Shell Blocks of 2026

Last Updated - 2026/02/04

1
Best Choice

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

SpiroPure

SpiroPure SP-EP-20 20x2.5 5 Micron NSF Certified Coconut Shell Carbon Block Water Filter Cartridge EP-20 155529 CB-25-2005 (Case of 6)

SpiroPure

CA$216.65

More Details
Main highlights
- QUALITY REPLACEMENT: 20” x 2.5” PAC (Powdered Activated Carbon) water filters, compatible with EP-20 / 155529 CEP-20E / 155788-43 and CB-25-2005
- NSF CERTIFIED: This filter cartridge is tested and certified by NSF International to NSF/ANSI Standard 42 for material requirements only
- 5 MICRON RATING: With a nominal filtration rating of 5 micron, our quality NSF Carbon filter reduces fine sediment particles and chlorine taste & odor from tap water
- 30-DAY GUARANTEE: SpiroPure filters have a 30-day money back guarantee. If you do not like the performance of your filter, you can send it back within 30 days of purchase for a full refund
- 20x2.5 NOMINAL: 20” slim filter made with CTO coconut shell carbon filter media
CA$216.65
2

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Max Water

Max Water CTO 5 Micron 10"x2.5" Coconut Shell Carbon Block Replacement Filter Cartridge for Whole House Water Filtration System Compatible with WFPFC8002, FXWTC, WHEF-WHWC, AMZN-SCWH-5 (25 Pack)

Max Water

CA$146.00

More Details
Main highlights
- Wide-Range Compatibility: Designed to work seamlessly with under-sink, RO, and whole-house filtration systems, this carbon block water filter fits all standard 10-inch filter housings. An excellent choice for improving water quality in every corner of your home.
- Why Max Water - We have 15+ years of experience in water filtration industry providing solution with a smile to millions of families. Make Max Water your solution to all your filtration needs.
- Reliable Filtration for Your Home: Ideal for well water, this 10 x 2.5 carbon block filter captures microscopic contaminants and sediment. Upgrade your RO or whole house system with the Max Water Coconut Shell CTO 5 Micron Cartridge for clean, filtered water at every faucet.
- Long-lasting and Cost-effective: Max Water Coconut Shell CTO 1 Micron Filter Cartridge is built to last, offering long-term reliability and exceptional performance. With a size of 10 inches x 2.5 inches, this replacement cartridge effectively filters large volumes of water, reducing the frequency of cartridge changes. By investing in our durable cartridge, you not only enjoy the peace of mind of having clean water but also save money on replacement filters.
- Effortless Filter Replacement: This 5-micron Activated Carbon Filter is simple to install and replace, making it an ideal option for homeowners. Designed to fit most 10" filter housings, it allows for easy carbon filter swaps without the need for a plumber.
- Compatible Replacement Filters: Works with a variety of models including Apex IR-40, Everpure CG5-10, SCWH-5, GXWH20F, WFPFC8002, Dupont DWC30001, OmniFilter TO1-SS24-01, GE FXWTC, Cornelius WFDWC30001, DEV9108-15, Ace Hardware 84608, FXWTC, WFPFC9001, and more.
- Compatible Filter Housing Models: Works with Whirlpool WHEF-WHWC, Pentair DEV9108-15, Watts F109009, CTO-10, Sears 34370, OptiPure W-5, Pure-Tel W5CIP, FLTR-2112, WHKF-WHWC, and more.
- Advanced Filtration Technology: The Max Water CTO Coconut Shell Carbon Block Filter uses cutting-edge 5 Micron filtration to deliver the highest level of water purity. This filter effectively filters impurities, chlorine, and sediments, ensuring that you enjoy crisp, clean, and great-tasting water for all your household needs, whether for drinking, cooking, or other uses.
CA$146.00
3
Best Value

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Max Water

Max Water 20 x 4.5 CTO Carbon Block Filter Cartridge 5 Micron Whole House Water Filter Replacement Compatible with FC25B, EPM-20BB, CB-BB-20, CTO20BB, 2-Pack

Max Water

CA$98.95

More Details
Main highlights
- Universal Compatibility: Our carbon block water filter fits most standard 20-inch whole house water filter housings, including FC25B, EPM-20BB, CB-BB-20, CTO20BB, iSpring HB28BX2, WGB12B. Its versatile design offers great flexibility. (Please verify size before ordering.)
- Superior Filtration: Our 20 x 4.5 CTO carbon block water filter made from premium coconut shell activated carbon to effectively reduce chlorine, sediment, bad taste, and odors, delivering cleaner, better-tasting water throughout your home.
- Maintains Strong Water Flow: Engineered to support consistent water flow in whole house water filter systems while providing effective carbon block filtration. Flow rate may vary based on system design, water pressure, and incoming water conditions.
- Long-Lasting & Efficient: Built for reliable performance in whole house water filtration systems, this 5 micron activated carbon block filter offers high dirt-holding capacity and extended service life. Actual lifespan depends on water quality and household usage.
- Easy DIY Installation: Designed for quick, tool-free replacement with standard 20-inch water filter housings. It provides a long-term solution that ensures continuous access to pure, filtered water without the need for professional help.
- 5 Micron Carbon Block Performance: Designed with a dense 5-micron carbon block structure to improve water quality while helping protect plumbing, fixtures, and water-using appliances from sediment and other particulate buildup.
CA$98.95
4

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Max Water

Max Water 20 x 4.5 CTO Carbon Block Filter Cartridge 5 Micron Whole House Water Filter Replacement Compatible with FC25B, EPM-20BB, CB-BB-20, CTO20BB, 2-Pack

Max Water

CA$98.95

More Details
Main highlights
- Universal Compatibility: Our carbon block water filter fits most standard 20-inch whole house water filter housings, including FC25B, EPM-20BB, CB-BB-20, CTO20BB, iSpring HB28BX2, WGB12B. Its versatile design offers great flexibility. (Please verify size before ordering.)
- Superior Filtration: Our 20 x 4.5 CTO carbon block water filter made from premium coconut shell activated carbon to effectively reduce chlorine, sediment, bad taste, and odors, delivering cleaner, better-tasting water throughout your home.
- Maintains Strong Water Flow: Engineered to support consistent water flow in whole house water filter systems while providing effective carbon block filtration. Flow rate may vary based on system design, water pressure, and incoming water conditions.
- Long-Lasting & Efficient: Built for reliable performance in whole house water filtration systems, this 5 micron activated carbon block filter offers high dirt-holding capacity and extended service life. Actual lifespan depends on water quality and household usage.
- Easy DIY Installation: Designed for quick, tool-free replacement with standard 20-inch water filter housings. It provides a long-term solution that ensures continuous access to pure, filtered water without the need for professional help.
- 5 Micron Carbon Block Performance: Designed with a dense 5-micron carbon block structure to improve water quality while helping protect plumbing, fixtures, and water-using appliances from sediment and other particulate buildup.
CA$98.95
5

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

PUREPLUS

PUREPLUS Coconut Shell Water Filter Cartridge | Activated Carbon Block CTO | Universal Whole House 5 Micron 10 inch Cartridge | Compatible with WFHDC8001, CB-BB-10, EPM, EP-BB, 3Pack

PUREPLUS

CA$84.99

More Details
Main highlights
- Heavy Metal Removal: Heavy metals pose significant health risks when present in drinking water. The activated carbon in our cartridge effectively adsorbs and binds to heavy metal ions, while the KDF media employs a reduction-oxidation process to neutralize and remove these contaminants from your water supply, providing you with cleaner and safer drinking water.
- Enhanced Filtration Lifespan: The combination of activated carbon and KDF media ensures consistent and reliable performance over time, allowing you to enjoy the benefits of clean and purified water for longer durations before cartridge replacement is necessary.
- Comprehensive Water Purification: The advanced activated carbon and KDF cartridge offers comprehensive water purification. In addition to heavy metal removal benefits, it efficiently reduces chlorine, unpleasant tastes, odors, and other common water impurities, resulting in a refreshing and clean drinking water experience.
- Compatible Models: Fits standard 10" x 4.5" heavy-duty filter housings, compatible with DuPont WFHDC8001, Watts MAXETW-FF975, ClearChoice 84629, Liquatec CB-450-975-05, MATRIKX-CTO2-HD10, Pelican CB-BB-10, and 155548-43 EP-BB. Works with most systems using 10" x 4.5" filters.
- Activated Carbon and KDF Blend: Our Advanced Activated Carbon and KDF Stick Cartridge is crafted using a carefully balanced mixture of activated carbon and KDF. This combination maximizes the filtration efficiency and ensures optimal removal of heavy metals, including lead, mercury, arsenic, and more.
CA$84.99

5 Best Shell Blocks of 2026

SpiroPure SP-EP-20 20x2.5 5 Micron NSF Certified Coconut Shell Carbon Block Water Filter Cartridge EP-20 155529 CB-25-2005 (Case of 6)

Max Water CTO 5 Micron 10"x2.5" Coconut Shell Carbon Block Replacement Filter Cartridge for Whole House Water Filtration System Compatible with WFPFC8002, FXWTC, WHEF-WHWC, AMZN-SCWH-5 (25 Pack)

Max Water 20 x 4.5 CTO Carbon Block Filter Cartridge 5 Micron Whole House Water Filter Replacement Compatible with FC25B, EPM-20BB, CB-BB-20, CTO20BB, 2-Pack

Max Water 20 x 4.5 CTO Carbon Block Filter Cartridge 5 Micron Whole House Water Filter Replacement Compatible with FC25B, EPM-20BB, CB-BB-20, CTO20BB, 2-Pack

PUREPLUS Coconut Shell Water Filter Cartridge | Activated Carbon Block CTO | Universal Whole House 5 Micron 10 inch Cartridge | Compatible with WFHDC8001, CB-BB-10, EPM, EP-BB, 3Pack

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