NSF certification mark is an authoritative testimonial for water filtration products. This certificate tests products material safety and structural integrity to make sure that the filtered water is safe for drinking. Normally, domestic water filters as well as filtration systems will follow several NSF test standards respectively are NSF/ANSI 42, NSF/ANSI 53, NSF/ANSI 372, NSF/ANSI 401 to assure specific guarantees and performances of products.

1. NSF/ANSI 42

NSF/ANSI Standard 42 tests POU (Point-of-use) and POE (Point-of-entry) water filtration products that reduces aesthetic or non-health-related contaminants as well as impurities. This standard usually fits carbon filtration products and most whole house water filters.

2. NSF/ANSI 53

This standard represents as a Health Effects standard for POU and POE water filtration products. It tests material safety, structural integrity and health-related particles reduction claims based on different products. Over 50 contaminant reduction claims are available under NSF/ANSI Standard 53. Some of the contaminants and pollutants includes asbestos, bacteria, cysts, lead, mercury and VOCs.

3. NSF/ANSI 372

NSF/ANSI Standard 372 proves that a prodcut has been certified as meeting a required lead content of ≤ 0.25%. When specific water filtration products used with respect to pipe fittings and plumbing systems, this certificate will be required for guarantee.

4. NSF/ANSI 401

This standard proves that a water filtration product has the ability to filter out up to 15 individual emerging compounds and incidental contaminants covers prescription drugs, over-the-counter medications, herbicides, pesticides and some chemical compounds.