The Hydronix SDC-45-2001 sediment water filter, available here in a 6-pack, is a 100% pure polypropylene cartridge. It is a perfect pre-filter for ultra-fine filtration--reducing sand, silt, rust, and scale. It is a compatible replacement cartridge for many brands of 20-inch Big Blue sediment filters.

• 1 micron ultra-fine sediment filter for cleaner water
• Graded density for higher dirt holding capacity
• For optimum dirt-holding, replace about every 2-3 months
• Materials ANSI/NSF Standard 42 tested and certified