CTO Water Filter

CTO Water Filter

4.5 x 20 inches iSpring FC25B Comparable CTO Carbon Filters OEM Wholesale Orders
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4.5 x 20 inches iSpring FC25B Comparable CTO Carbon Filters OEM Wholesale Orders

Adopts higih-end NSF 42 qualified activated carbon block. Fits with most standard 20 inch big blue whole house water filter systems.

Product Specification:
  • Item: CTO Carbon Block Filter
  • Model: CTO20BB
  • Size: 20 x 4.5 inches
  • Micron: 1, 5, 10, etc.
  • Replaces: iSpring FC25B
  1. Product Details
  2. Company Profile
  3. Request a Quote

fc25b filter




1. Excellent Performance

Reduces up to 99% of Chlorine, sand, rust, sediment, taste and discolorations. It owns a great effect on tap water filtration. 

2. Clean & Safe Raw Materials

Our whole house carbon filter is made of 100% coconut shell activated carbon block to filter most sediments. Innovative sintering technology ensures a high absorbing capacity and offers a well filtration of suspended particles and dirt.

3. Stringent Production

Our filters are manufactured under the ISO9001 standard and inspected under strict quality control. Produced through 34 production processes, 400PSI pressure test, 10,000 water hammer tests, and 6 independent tests.

4. Everlasting Filtration Life

Effectively filters up to 30000 gallons depending on water quality. Suggest to change it every 3-6 months for the average household for optimal performance depending on the use.

5. Widely Compatibility

Perfectly replaces filters of iSpring FC25B; Pelican CB-20; Pentek EPM-20, CBC-20; Hydronix CB-45-2010; Watts WCBCFF20, etc. Note: All brands, models and trademarks are used for compatibility referenec only.


ispring cto carbon filter





  CTO Carbon Block Filter




  NSF Tested Coconut Shell Activated Carbon




  iSpring fc25b

  Filter Life

  3 to 6 months or 30000 gallons water (depends on water quality)

  Compatible Filters

  iSpring FC25B

  Pelican CB-20

  Pentek EPM-20, CBC-20

  Hydronix CB-45-2010

  Watts WCBCFF20

  Note: All above brands, models and trademarks are used for compatibility referenec only.



Frequently Asked Questions


1. Q: What is your minimum order quantity?

    A: Normal order: 100—200 pcs; OEM order: 500 pcs

2. Q: How is your product delivered?

    A: Samples: DHL/TNT/UPS expresses; Bulk goods: sea transportation

3. Q: Is your product suitable for small businesses?

    A: We supply products for small business owners.

4. Q: Do you offer a free trial or demo of your product?

    A: We offer free samples for tests before official orders.

5. Q: Do you offer custom plans or packages for larger organizations?

    A: We support OEM, ODM, private label and packages based on requirements.

6. Q: What information should I let you know if I want to get a quotation?

    A: 1) Model number. 2) Size and dimension. 3) Function requirements. 4) The brand. 5) Quantity.



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