Complete your 4.5” x 20” Water Doctor system with the right filter for your needs. This collection of high-performance 4.5” x 20” filter cartridges is specifically designed for Water Doctor WF-20B, WF-20BC, WF-20B2, and WF-20B3 housings. Whether you’re targeting sediment, chlorine, or taste & odor — we have the perfect filter for your system.
Available Filter Types:
PP Sediment Filter (Polypropylene) ➤ Captures sand, silt, rust, and dirt ➤ Perfect for whole house or pre-filtration setups ➤ Recommended Replacement: Every 6 months
PS Spun Sediment Filter ➤ Graded density for depth filtration ➤ High dirt-holding capacity ➤ Recommended Replacement: Every 6 months
PL Pleated Sediment Filter ➤ Washable & reusable ➤ Higher flow and surface area ➤ Recommended Replacement: Every 6–12 months
CTO Carbon Block Filter ➤ Removes chlorine, VOCs, and improves taste & odor ➤ Dense structure for effective chemical removal ➤ Recommended Replacement: Every 6–12 months
GAC Granular Activated Carbon Filter ➤ Great for high-flow filtration ➤ Removes chlorine, organic chemicals, and odors ➤ Recommended Replacement: Every 6–12 months
Compatible Systems:
Water Doctor WF-20B
Water Doctor WF-20BC
Water Doctor WF-20B2
Water Doctor WF-20B3
All standard 4.5” x 20” Big Blue-style housings
All filters are made from premium food-grade materials, safe for use in home or commercial filtration setups.
