Address: 1016 Dale Lane
Mt. Vernon, WA 98274
Toll Free: (800) 255-1895
Phone: (360) 428-5880
Fax: (360) 424-8118

Mark 26 Column

U.S. Patent: 4,842,644

The Mark 26 contains thirty-eight pounds of chopped iron fiber for the best in silver recovery. A unique, patented method of packing and internal distribution assures the highest volumes of throughput with excellent silver recovery performance. Test indicate that up to 600 Troy ounces of silver can be recovered. The column is rated at 120 psi, thus eliminating leaks or tops blowing off. The column itself is a DOT approved shipping container, so no additional containment packaging is necessary for shipping. Columns are shipped back to Hallmark via motor freight. PVC plugs are provided for secure shipping.

Key Benefits

  • The column is recycled and reused to minimize its environmental impact
  • Durable fiberglass shell rated to 120 psi
  • Flexible use as either a Primary or Tailing column after electrolytic silver recovery
  • Internal distribution and packing of iron fiber maximizes silver recovery performance
  • Flow rates of 200 mL/min for Primary use and 300-500 mL/min as Tailing optimize silver recovery efficiency
  • High capacity allows a large quantity of effluent throughput
  • Properly managed, the columns can maintain silver discharge levels at or below 1 ppm
  • Designed for pumped applications only - NOT for gravity fed systems


Column Potential Primary: 1500 gallons Dry Shipping Weight: 90 pounds
Column Potential Tailing: 9000 gallons Wet Shipping Weight: 300 pounds
Recovery Efficiency: as low as 0.5 ppm (mg/L) Recovery Capacity: up to 900 Troy Ounces