Whole House Filters for Iron and Manganese Reduction.Iron is one of the most common elements found in nature, and most ground waters contain a measurable amount of iron. Iron stains bathtubs, toilets, sinks, driveways, and it will even stain the side of your house in sufficient concentrations. We offer two media types to remove Iron in point-of-entry applications.Greensand-PlusAn enhanced version of the traditional medium to remove Iron from water.Greensand-Plus System Advantages1. Lower backwash requirements.2. Known saturation capacity.3. Higher Temperatures and differential pressures than traditional Manganese Greensand.4. Greensand-Plus is also used for radium reduction.5. User friendly, low maintenance electronic time clock valve.Greensand-Plus Specs1. Gallons Per Minute: 32. Gravel: 10 Lbs3. Back Wash Gallons Per Minute: 5.34. PSI Drop: < 155. Floor Space 16X21X55