Chlorine-Free, Pure Water – This replacement filter set for the iSpring WGB31B whole house water filter includes a 10" x 4.5" sediment filter (FP15B) and two CTO carbon block filters (FC15B) — removing up to 99% of chlorine, along with sediments, rust, tastes, odors, herbicides, and more for clean, odor-free water. Built to Last – Designed for durability, this water filter set delivers reliable performance for up to 50,000 gallons or 12 months, depending on water usage and quality. It is a long-lasting solution for those seeking a dependable whole house water filter replacement. Individually Sealed for Freshness - Each cartridge arrives factory-wrapped to preserve cleanliness and peak performance; simply remove the wrap before installation Peace of Mind Guaranteed – Backed by lifetime U.S.-based technical support. We’re here to assist you every step of the way as you replace filters and keep your whole-house system performing at its best. Healthy Minerals Retained – This filter retains healthy minerals and does not reduce TDS. For total dissolved solids removal, explore our iSpring Reverse Osmosis systems.