Minimize concerns of biological contamination, while improving the taste, smell, and clarity of your water supply. Patented dual-zone nylon membrane bacteria barrier. WV-B3 model at 3.5 gpm connects to your main line for drinking, cooking, or bath water. Reduces up to 99.99% of bacteria, algae, and mold spores. Also reduces greater than 95% of chlorine. Significantly decreases sediment, dirt, rust, sand, and silt to 0.2 micron. Replacement cartridge sold separately (#82671).