H2O International H2O-US4 Deluxe 5 Stage Under Sink Filter w/ Faucet Complete point-of-use filtration system with dedicated drinking water faucet KDF Media GAC Carbon Lead Reduction Includes Faucet The H2O-US4 delivers five stages of filtration under your sink with a complete installation kit including a dedicated drinking water faucet. This system combines sediment filtration, KDF process media, and granular activated carbon to address chlorine, heavy metals, chemical contaminants, and particulate matter in municipal water supplies. HOW IT WORKS Five-Stage Filtration Process 1 SEDIMENT Pre-Filtration Removes dirt, rust, silt, and suspended particles that cause cloudiness and can damage downstream media 2 KDF Heavy Metal Reduction KDF process media uses redox reactions to reduce lead, mercury, and other dissolved metals while controlling bacteria and scale 3 GAC Chemical Contaminant Removal Large granular activated carbon bed adsorbs chlorine, volatile organic compounds, pesticides, and industrial solvents 4 CARBON Taste and Odor Polish Additional carbon stage removes residual chlorine taste and odor for clean-tasting drinking water and ice 5 POLISH Final Filtration Final polishing stage ensures consistent water quality at the dedicated faucet for drinking, cooking, and beverage preparation COMPATIBILITY Installation Requirements The H2O-US4 installs under standard kitchen sinks with adequate cabinet space for the five-stage housing assembly. System includes all necessary tubing, fittings, and a dedicated drinking water faucet that mounts through the sink deck or countertop. Connects to standard cold water supply lines with 3/8-inch compression fittings. Suitable for municipal water supplies and well water with adequate pre-treatment for sediment and hardness.