Sponge iron is a kind of environmentally friendly water treatment processing. Using an activation treatment of highly active, large specific surface area of sponge iron type filter material deoxidizer. Room temperature processing of industrial water (or water) is an ideal effect (residual oxygen content: 0.03 to 0.05 mg/L), the product supporting facilities has the advantages of low investment, simple maintenance, low cost of transportation, oxygen advantages with good effect, can be widely used in boilers and circulating water equipment, is a kind of high performance and energy saving products. Sponge iron with the activity of specializing in the production of sponge iron (direct reduced iron) to remove dissolved oxygen in water, sponge iron main component is iron, the internal structure of the porous, provides the specific surface area of 5-100000 times that of ordinary iron filings, can make the water of oxygen and iron quickly complete oxidation reaction. Reaction product Fe (OH) 2, Fe (OH) 3 is not easy to dissolve in water floc, when with water flow through the rest of the sponge iron particles was stopped, as long as the use of a certain intensity backwashing water can rinse (about 5 minutes).