UPDN Series, tested and certified to the ANSI/NSF 42/61 standard. These cartridges will not impart unwanted leached materials into the downstream flow. Nominal micron ratings of 0.5 to 200, with 3.75” to 72” lengths and 2” to 6” outside diameters insure compatibility with standard housings. Optional end cap treatments available. UPDN Cartridges are in use at state/federal correctional institutions, office buildings, municipal water districts, DOD and other applications where the ANSI/NSF 42/61 standard is required.