Sponge iron has good reduction activity and high specific surface area characteristics, as water oxygen scavenger sponge size is 2-5mm, high porosity, large surface area, high activity, reaction with oxygen in the water can easily generate Fe3O3, so as to achieve the purpose of oxygen, the reaction product is readily soluble in water flocculent precipitate, was blocked off, with a certain intensity of backwash water can rinse hardness uniformity coefficient k80≤1.8 5--7 porosity containing 30-50% ash sponge iron filter Product Details: sponge iron has good reduction activity and high specific surface features, as water oxygen scavenger sponge size is 2-5mm, high porosity, large surface area, high activity, vulnerable reacts with the oxygen in the water to generate Fe3O3, so as to achieve the purpose of oxygen, the reaction product is readily soluble in water flocculent precipitate, was blocked off, with a certain intensity of backwash water can rinse 5--7 hardness uniformity coefficient k80 ≤1.8 porosity of 30-50% ash content <0.5