DuPont Universal Whole House String Wound Cartridge PFC4002 (4 Pack) DuPont Universal Whole House String Wound Cartridge PFC4002 (4 Pack) Filters up to 15,000 gallons for home or office Includes 4 universal 10-inch cartridges that fit all DuPont Whole House Water Filter Systems and most other brands of standard-size systems Lasts up to 3 months. 15 microng filtration level