General Description of IROX N70 Iron Removal Media

IROX N70 is a black or light brown, granular, naturally mined filter media composed of high-purity manganese dioxide. This one is a solid manganese dioxide offering higher flow rates and faster reaction times. The media is used for iron removal and oxidation-reduction filtration process similar to manganese greensand, but at a far higher level of performance, and lasts many years longer due to its solid form and higher purity. IROX N70 works by adsorbing the oxidized species of iron, manganese, or sulfides on the external as well as the porous internal structures of the media. This is a catalytic process that processes water at a faster flow rate than traditional manganese media. 

PHYSICAL PROPERTIES

ADVANTAGES

• Iron reduction over wide pH
• Effective reduction of hydrogen sulfide in addition to iron and
• No harmful effects from chlorine
• Low attrition for long-bed

pH

pH of Raw waters having a natural pH of 6.5 or above can be filtered through IROX N70 without pH correction. Raw waters with a pH lower than

6.5 should be pH-corrected to 6.5- 6.8 before filtration. Additional alkali should be added following the filters if a pH higher than 6.5-6.8 is desired in the treated water. This prevents the possible adverse reaction and formation of a colloidal precipitate that sometimes occurs with iron and alkali at a pH above 6.8.

BED TYPE

Bed Type Dual media: anthracite 18-20 in. (450 mm – 500 mm) and Irox N70 24-30 in. (600 mm – 750 mm)

CAPACITY

700-1200 grains of oxidized iron and manganese/sq.ft. of bed area based on oxidant demand and operation to iron breakthrough or dp limitations.