String wound filters from UFI provide true depth filtration, high dirt holding capacity, and extremely low media migration. They are one-piece cartridges manufactured using a high speed, continuous wind process and available in 14-string, 7 core, and 12 material and end cap options. Our UPDN series of polypropylene string cartridges is Gold Seal Certified to the ANSI/NSF 42/61 standard.
