Purenex 3PP-10B 1 Micron Whole House Water Filter Sediment, 10-Inch, Blue, 3-Pack Melt-Blown Polypropylene 4-layer graded density with a 1 micron nominal filtration rating Universal replacement for all 4.5" x 10" Big Blue filter cartridges 3 filters, individually wrapped Removes dust, particles, and rust Filter life: 10,000 gallons