Berkefeld products by Doulton are manufactured in an EPA-registered establishment.

Ultra Sterasyl Filters are NSF Certified.

What is NSF Certification of  Water Filter Systems?
In the United States, NSF International (formerly the National Sanitation Foundation) works to protect consumers by providing third-party testing, written standards, and validation of products available to the public.

The table below is a visual to help consumers understand the gravity water filter space.

Understanding NSF 42, 53, 372 and 401 Codes

  • NSF/ANSI 42 – Aesthetic Effects
  • NSF/ANSI 53 – Health Effects
  • NSF/ANSI/CAN 372 – Lead Content
  • NSF/ANSI/CAN 401 – Emerging Compounds / Incidental Contaminants

British Berkefeld Ultra Sterasyl vs BOROUX foundation.™ Black Filters

Company

Best Choice


British Berkefeld®/ Doulton®


Boroux®

Filters

BOROUX foundation.™ Filter

NSF/ANSI Std
42 Accreditation 


Aesthetic Effects

NSF/ANSI Std
53 Accreditation 

Health Effects

NSF/ANSI Std
372 Accreditation

Lead Content

NSF/ANSI Std
401 Accreditation

Emerging Compounds / Incidental Contaminants

Pour Through NSF Accreditation

Micro Biological Klebsiella

Micro Biological E-coli