HWTS Design Guidelines
Surface finishes: paints, glazes, and colorants
- Paints, colorants, inks, and glazes used on HWTS products and packaging should meet relevant national standards (or US/ISO in the absence of national standards) for food-grade materials and packaging.
- Paints, colorants, inks, and glazes are resistant to disinfectants (halogens or others) used to treat water.
- All materials in contact with drinking water for a drinking water treatment unit comply with NSF Standards 42 and 53 and any other technology-specific NSF standard (e.g., 44, 55, 58, 62).
Notes and exceptions
- Toxins such as lead, present in many paints and glazes, disproportionately affect developing fetuses, infants, and small children.
For the most up-to-date information, access the guidelines online: