Whole house water filter replacement cartridge helps reduce chlorine, bad taste, and odor so every tap delivers fresher-smelling water. This 4.5" x 20" CTO carbon block cartridge is designed for high-capacity whole home filtration, supporting steady flow while trapping fine sediment down to 5 microns. Made with coconut shell activated carbon, it’s a practical fit for most standard “Big Blue” style housings.

Keep your whole-home system performing at its intended level with a dependable CTO carbon block swap. The coconut shell carbon media targets chlorine taste and odor while the dense block structure helps capture small particles that can affect water clarity. Each cartridge is built for consistent performance and straightforward changes during routine upkeep. If you’re noticing off-tastes, lingering odors, or it’s time for your scheduled change, grab yours today and refresh your water at the source.