Ecopure Water Softener, 31,000 Grain Demand Regeneration Unit, Highly Efficient With Predictive Technology That Learns Your Water Usage, Regenerates Only When Needed, Free Technical Support, Space Saving Compact Design, Reduces 8-PPM Of Iron, Household Size 1 To 4 People, 1 Year Parts & Labor Warranty, 3 Year Electronics Warranty & 10 Year Tank Warranty.