EcoPure EP7140 40,000 Grain Water Softener - Built in USA - NSF Certified - Best Value - Demand Initiated Regeneration AutoSense Technology  this exclusive feature automatically calculates how much salt and water is required to regenerate and only uses what is necessary, resulting in a significant reduction in salt and water usage EcoPure EP7140 is ideal for households of 1-6+ people and removes high levels of water hardness and clear water (ferrous) iron EcoPure Water Softeners are NSF certified to reduce hard water symptoms around your house such as embarrassing stains, buildup on your faucets, and spotting on dishes, and helps your water using appliances operate more efficiently 1 year full parts and labor warranty provides in-home service by a nationwide network of factory trained technicians: 2 year parts and labor warranty available with the purchase of EcoPure EPCL water softener cleaner (sold separately) Designed, engineered and assembled in the USA. Questions? Call the EcoPure helpline at (800) 693-1138.