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

Ultra Sterasyl Filters are NSF Certified.

Visit Doulton’s Company Profile on NSF Website

What is NSF Certification of UV 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.

For example, almost every product in a commercial kitchen is NSF certified. Freezers, sinks, ovens, ice makers, and cutting boards –all must all be NSF certified in a commercial kitchen.

These standards ensure quality and safety in not only restaurants and cafeterias, but in many other industries as well, including water filter systems.

NSF Certification Steps:

  1. Step 1 is an application to be admitted to the NSF’s testing process
  2. Step 2 is where the company submits detailed information on product formulation, toxicology, and product use information.
  3. Step 3 is where the NSF’s technical team performs a thorough review of the formulation and parts list for the filter system in question.
  4. Step 4 is an on-site audit, where NSF technicians tour the production facility and gather samples of products and materials used in the filter system.
  5. Step 5 has these technicians return to the NSF laboratory, where the filter and its components undergo a battery of tests to prove their efficacy.
  6. Step 6 is a final technical evaluation that takes into account every step before it. It’s a final check-over that acts as a safeguard against anything that might have been missed in the process.
  7. Step 7 is the awarding of certification, and companies must renew this certification annually by going through steps 2 through 6 again.

What Is NSF Certification?

Millions of people take the safety of their food, water and consumer products for granted on a daily basis. Why? Because of three letters: NSF. NSF certification is your key to making sure that the products you use meet strict standards for public health protection.

Choosing a product certified by NSF lets you know the company complies with strict standards and procedures imposed by NSF. From extensive product testing and material analyses to unannounced plant inspections, every aspect of a product’s development is thoroughly evaluated before it can earn our certification.

Most importantly, NSF certification is not a one-time event, but involves regular on-site inspections of manufacturing facilities and regular re-testing of products to ensure that they continue to meet the same high standards required to maintain certification over time. If for any reason a product fails to meet one or more certification criteria, NSF will take enforcement actions to protect you, including product recall, public notification or de-certification.

Products that earn NSF certification are said to be “NSF certified” or “NSF listed” and display the applicable NSF certification mark to show that they have been tested by one of today’s most respected independent product testing organizations.

https://www.nsf.org/knowledge-library/what-is-nsf-certification