Specifications:

• Media: MTM, Replaces Greensand, 1Cu Ft. (27 lbs)
• Clack MTM is a granular manganese dioxide filtering mediaused for reducing iron, manganese and hydrogen sulfidefrom water.
• Its active surface coating oxidizes and precipi-tates soluble iron and manganese.
• Hydrogen sulfide is oxidized to a sulfur.
• The precipitates are filtered out in the granular bed and removed by backwashing.
• MTM consists of a lightweight granular core with a coating ofmanganese dioxide.
• The coating provides an example of con-tact filtration where the media itself provides the oxidizing potential.
• This allows for a much broader range of operationthan many other iron removal media.
• A pH level as low as 6.2 can be treated.
• Dissolved oxygen is not essential.
• The media’s lightweight reduces backwash water requirements.
• When the oxidizing power of MTM is reduced, the bed has tobe regenerated with a weak solution of potassium perman-ganate (KmnO4), thus restoring its oxidizing capacity.
• Are generating solution of 1-1/2 to 2 ounces (dry weight) ofpotassium permanganate per cubic foot is sufficient for nor-mal regeneration.
• Upon start-up a new bed should be back-washed and caution taken to insure that the light weight media is not backwashed to drain.
• A new bed should be regenerated the evening of installation.
• Operating the filterafter its oxidizing capacity is exhausted will reduce its service life and may cause staining.
• MTM requires either intermittent or continuous regenerationto maintain its oxidizing capacity.
• A solution of potassium permanganate (or chlorine then potassium permanganate)can be pre-fed to maintain capacity.
• In the latter case, the manganese dioxide coating acts as a catalyst to enhance the oxidation reaction and as a buffer to reduce any excess potassium permanganate concentration and prevent it from entering the service lines.
• Capacity Per Cu. Ft.: Iron (Fe+2) alone 600 grains (10,000 ppm) Manganese (Mn+2) alone 300 grains (5,000 ppm) Hydrogen Sulfide (H2S) alone 175 grains (3,000 ppm)
• Advantages: Broad operating range for iron reduction
• Lower pressure loss through the bed with high- flock holding capacity
• Effective hydrogen sulfide, iron and manganese reduction
• Lightweight requires lower backwash rates and reduces pumping requirements.
• Chlorine can be beneficial in extending filter run times Low attrition loss for long bed life.
• Conditions for Operation: Water pH range: 6.2 – 8.5
• Maximum water temp: 100°F/38°C Bed Depth: 24-36 in.
• Freeboard: 50% of bed depth (min.)
• Service flow rate: 3 – 5 gpm/sq.ft., 8 – 10 gpm/sq.ft. intermittent flow possible.
• Backwash flow rate: 8 – 10 gpm per sq. ft.
• Backwash expansion rate: 20 – 40% of bed depth (min.)
• Regenerate dosage: 1-1/2 to 2 oz of KMnO4by weight per cu. ft.
• Physical Properties: Color: Dark brown
• Bulk Density: 45 lbs./cu. ft.
• Specific Gravity: 2.0 gm/cc Effective Size: 0.43 mm.