Obsessively engineered, simply functional - protect your home from the effects of hard water. Perfect for 1-4 people. Reduce scale buildup, water stains and spots, improve skin and hair softness, extend the life of your appliances, and preserve your favorite clothing. Salt-sensing technology—adapts to your water usage, allowing for less salt, water and energy use. Designed, engineered and built to last; patented, slim, single-unit design with bypass valve. No filter changes—ever; save time and money with the self-cleaning pre-filter. Fast and quiet regeneration—recharges softening media to supply more soft water to your home. Power loss protection—backup battery saves your settings in case of power loss. Limited 3/10 year limited warranty; three (3) years for mechanical and electronic parts; ten (10) for media tank/main control valve and brine cabinet