HWTS Design Guidelines
- Ceramic materials used in water containers and/or filter elements meet quality control standards and pose no health risks to users.
- All materials in contact with drinking water for a drinking water treatment unit should comply with NSF Standards 42 and 53.
- Ceramic materials (including glazes and treatments) in contact with water meet US Title 21 CFR Part 174.5 and 174.6.
Notes and exceptions
- Ceramic components are familiar and may appeal to first-time users who will later upgrade to more effective devices.
- Ceramic filter elements provide minimal microbial protection and may not meet log reduction value (LRV) effectiveness targets.
- Ceramic filter element efficacy must be balanced against tolerable flow rates. The fragility and weight of ceramic containers and filter elements add to distribution costs.
- Ceramics are difficult to control for quality and consistency.
For the most up-to-date information, access the guidelines online: