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

Mark 15 Column

U.S. Patent: 4,842,644

The Hallmark Mark 15 Column is the proven Industry Standard for pressurized silver recovery systems. It is 24" in diameter and 46" tall. The Mark 15 Column contains twenty five pounds of chopped iron fiber. A unique method of packing and internal distribution assures the highest volumes of throughput with excellent silver recovery performance. Tests indicate that up to 300 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.

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: 800 gallons Dry Shipping Weight: 60 pounds
Column Potential Secondary: 2000 gallons Wet Shipping Weight: 150 pounds
Recovery Efficiency: as low as 0.5 ppm (mg/L) Recovery Capacity: up to 300 Troy Ounces