Fortress Filtration Qty(50) Sediment 5 Micron 20" x 2.5" Water Filters RO/WVO/Cartridges/Case/PP Fortress Filtration Premium Water Filters Full Case of 50 Sediment Filters!! 5 Micron, 20" x 2.5" In Stock - Ready to Ship!! - These are standard sized filters and fit most 10" x 2.5" water filter housings. With Fortress Filtration products, you are being protected by the best!