Aquaboon 2PP-20B 1 Micron Big Blue Whole House Water Filter Sediment, 20-Inch, 2-Pack Melt-Blown Polypropylene 4-layer graded density with a 1 micron nominal filtration rating Universal replacement for all 4.5" x 20" Big Blue filter cartridges Pair of 2 filter; individually wrapped Removes dust; particles; and rust Filter life: 10,000 gallons