This is a 2 pack of filters NOTE THESE ARE Antimicrobial/ MICROBAN FILTERS DOESN'T PROMOTE BACTERIA GROWTH Frequently Asked Questions: What is Microban & antimicrobial product protection? Microbanreg; technology is built-in antimicrobial protection for solid products, coatings and fibers. Microban antimicrobial protection gives products an added level of protection against damaging microbes such as, bacteria, mold and mildew that can cause stains, odors and product deterioration. How do products with Microban & antimicrobial protection work? Microbanreg; protection is built-in to the product during the manufacturing process. When microbes come in contact with the product surface, Microban protection penetrates the cell wall of the microorganism and disrupts cell functions disabling the microorganism's ability to function, grow and reproduce. What benefit do my customers get from products with Microban & antimicrobial protection? Microban protection continuously fights the growth of damaging microbes such as, bacteria, mold and mildew that can cause stains, odors Pleatco: PGS25P4 | Unicel: 4CH-24 | Filbur: FC-0131 Diameter: 4 5/8" Length: 9 3/4" Top: Handle Bottom: 1 1/2" MPT Threaded Filter Area: 25 sq ft Filter Material: reemay 3oz material Alternate Filter Names: 20254-238 | 17-175-1265 | APC 12519 | 212321 | 17-175-1264 | 373005 | PTL 20HS W/ PAD | PTL20HS W/ PAD AD | PTL 20HS | PGS25 W/ PAD | PTL20HS-P4 | PAQ25N | PAQ25-N Used in pools / spas made by: Advanced Spa Design | After Hours Spas | American Dream | Aqua Spa | Blue Ridge Spas | CTA Spas | DM Industries | Dream Maker Spas | Echo Series | Ft Wayne Spas | Gatsby | Heartland Spas | Hydro Spa | Icon Spas | Image Spas | Imperial Spas | Keyes Spas | La Spas | Lowes | Lumi-O | Maax Spas of AZ | Mountain Meadows Spa | Mountain Mist Spa | Mountain Springs Spa | Mountain Stream Spa | Nemco | Saratoga Spas | Softub | Vita Spas | Weslo | White Springs Spas and other manufacturers