20x4.5 inch Whole House Big Blue CTO Solid Carbon Block Water Filter Cartridge Replacements

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1. PUREPLUS CTO20BB filter can reduce up to 99% of redisual Chlorine, sand, rust, sediment, taste and color. Recommended for tap water filtration.

2. Made of 100% coconut shell activated carbon block to filter most sediments. Innovative sintering technology ensures high absorbing capacity offers a much finer filtration of suspended particles and dirt.

3. Each per filter is produced under the ISO9001 standard and inspected under strict quality control. Each filter is produced through 34 production processes, 400PSI pressure test, 10,000 water hammer tests, and 6 independent tests.

4. Able to filter up to 30000 gallons depending on water quality. Suggest to replace it every 3-6 months for the average household for optimal performance depending on daily water cosumption.

5. This filter can be used in any standard 20x 4.5 inch heavy duty filter housings and compatible for models of ClearChoice 84642, 84641, Pelican CB-20, Pentek 155783-43, EPM-20, CBC-20, Trojan CB-20, iSpring FC25B, Hydronix CB-45-2005, CB-45-2010, Watts WCBCFF20, etc.

Product details

  • Safe Materials

    Lead-Free and BPA-Free, food grade natural coconut shell activated carbon giving you wide range protection.

    High Grade Carbon Block】: Chlorine reduction rate >99%

    Recognized by Australia Water Mark】: food grade material

  • NSF/ANSI 42 certification information: Certificate W-11150, by IAPMO, 2021.

    High Grade Carbon Block: Chlorine reduction rate >99%

    Recognized by Australia Water Mark: food grade material

    Filter Life: Replace every 3-6 months or 30000 gallons depending on water quality.

    Micron Rating: 5 Micron

    Flow Rate: 2.5-5GPM

    Flow rate varies based on the regional water pressure/quality.

    Filter Dimensions: Length: 20 inch , Diameter: 4.5 inch

    Operating Temperature: 4-52℃/39-126℉

    Max. Operating Pressure: 100psi

    Operating working pressure: 60psi

Measurements & Compatible

  • Package Dimensions    20.5 x 4.5 x 4.5 inches

    Item Weight    4.69 pounds

  • Compatible Replacement Filters:

    Universal replacement for all 20" x 4-1/2" BB water filter housing and well-matched models of cartridges: ClearChoice 84642, 84641, Pelican CB-20, 155783-43, EPM-20, CBC-20, Trojan CB-20, iSpring FC25B, Hydronix CB-45-2005, CB-45-2010, Watts WCBCFF20, etc.

    NOTE: This is a compatible spare part and the manufacturers' names and part numbers have been used for reference purposes only.


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by Rod S.

I purchased this replacement filter for my system. Ordering and installation was easy. It removes chlorine and other harmful industrial chemicals. Now I can know the filtered water is 100% safe. Thanks for the product! So far this activated carbon water filter is working excellent.


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Purer & Fresher Than Ever

PUREPLUS aims to design, develop and sell high-quality, cost-effective water filtration products. Our company is committed to household water filtration. For decades, PUREPLUS is not only dedicated to selling filtration products, but also to provide high-quality water filtration solutions for every family. All PUREPLUS products are manufactured under the technical support of our experienced team of product experts.

How did we get our start?

PUREPLUS is headquartered in California and has 20+ years of expertise in the water filtration industry. Every year we supply filtration solutions to 200 million American families.

What makes our products unique?

PUREPLUS has an independent R&D team, that has applied for 2000 patents, and obtained certifications from NSF & IAPMO, European TUV, ROHS, UK WRAS, ACS, CSA, BPA Free and Water Mark. All of our products are produced under the ISO9001, 14000 standard and inspected under strict quality control.

Why do we love what we do?

Water is the source of life. Our dream is to protect the water health of every American resident and provide perfect filtration solutions and fresh water based on different regions water quality.

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Model Information List

Model Information List

whole house water filter cartridge replacement