The Pentair Whole House Iron Reduction System uses a catalytic coated mineral media to reduce iron, manganese and sulfur in your home's water to eliminate that rotten egg smell, metallic taste and dark stains on fixtures. So you can have water that's easy on skin, clothes, appliances and your nose. And the simple, electronic system makes programming a breeze and even maintains its settings during power outages. A singular water control disc, versus multiple moving parts, extends life and reduces maintenance while an automatic bypass keeps water flowing during regeneration.