Easy to install and use. A diverter valve replaces the aerator on your faucet, allowing one to switch between filtered and unfiltered water with ease. When filtered water is desired, turn on the faucet and push down on the diverter valve-knob water is routed through the filter and out its own swivel spout. Effectively removes chlorine, bad taste and other contaminants from water. Great for home, apartment, dorm, RV, or travel. Treats approximately 4,000 gallons depending on your water quality. Exceeds NSF standards.