FAQ : Manganese Greensand Iron Removal Filters

1) What concentration should be used in the potassium permanganate solution for regeneration of manganese greensand?

For most applications of manganese greensand, a solution of 100 gms (by weight) of potassium permanganate, mixed well, for each gallon of water is the proper proportion. However, for water at a temperature of less than 12 °C, more water may be necessary.

2) How long should the manganese greensand soak in the potassium permanganate solution to regenerate?

2-4 hours is the minimum recommended contact time at the above recommended concentration. Where possible, it is recommended to soak overnight to ensure sufficient regeneration.

3) Does exposure to chlorine harm manganese greensand?

No, chlorine is not detrimental to manganese greensand. However, when manganese greensand is exposed to chlorine solutions higher than 1%, permanganate can be formed, resulting in purple water

4) What is the life expectancy for manganese greensand media?

Manganese greensand has a useful life of 5-8 years. Longer times are possible in a properly operated filter, depending on service conditions.

5) What is the recommended back wash flow rate for manganese greensand?

12 Gallons per minute per square feet of media per tank, using water 12°C. Higher temperatures require higher flow.

6) How important is it to backwash a manganese greensand media bed?

Proper backwash is vital in extending the life of the media. Backwashing removes the dirt from the media bed, preserving the performance of the media.