Advanced Activated Carbon Fiber Filtration The HQUA WF-CF20BB Activated Carbon Fiber Filter Cartridge is designed for high-performance chemical and heavy metal reduction in whole house water systems. Compatible with the HQUA WF3-03 system, this filter provides cleaner, safer, and better-tasting water throughout your home. Improve Water Taste Activated carbon fiber material effectively reduces chlorine, unpleasant odor, color, VOCs, and other chemical contaminants. Its high adsorption efficiency helps deliver fresher and cleaner water for everyday use. Remove Heavy Metals This ACF filter helps remove heavy metals—including lead, mercury, arsenic, cadmium, and chromium—through redox reactions. It improves drinking water safety and keeps your home's water supply healthier for all family members. PFAS Reduction Capability This ACF filter helps reduce PFAS, including PFOA and PFOS, addressing emerging contaminants of concern in household water. High Adsorption Efficiency Compared with traditional carbon block or GAC filters, activated carbon fiber offers a larger surface area and faster absorption capability, making it more effective in removing contaminants and improving water quality. Large-Capacity Performance Standard Big Blue 20" × 4.5" size with an operating pressure range of 25–116 PSI. Supports household flow rates up to 15 GPM with minimal pressure drop. Recommended replacement every 6 months based on water quality and usage. Compatible with HQUA WF3-03 System Perfect fit for the WF3-03 whole house filtration system and other standard 20" BB housings. Easy to install and maintain, restoring optimal system performance with each replacement.