Metsorb® HMRG (Heavy Metal Removal Granules)

Highly Effective, Low-Cost Adsorbent for Reduction of Arsenic III & V and a Wide Variety of Heavy Metals

MetSorb® HMRG and HMRP adsorbents utilize a patented material to adsorb both forms of arsenic as well as a wide range of contaminants in water. Empty bed contact times as low as 10 seconds achieve high removal efficiencies. The material affords a higher capacity and a lower level of ion interference than competitive iron and alumina based products. 

MetSorb® HMRG media’s adsorptive capacity is 7-12 grams of arsenic per kilogram of HMRG adsorbent in drinking water applications with a pH range of 6.5-8.5. Much higher adsorptive capacities have been measured, up to 400 g/kg, in industrial treatment applications.

Adsorbent Product Features/Benefits

  • Removal of heavy metals to meet drinking water standards
  • High adsorbent capacity requiring less frequent replacement
  • Fast kinetics to work effectively at high flow rates
  • Nonhazardous disposal as solid waste


  • Arsenic III
  • Arsenic V
  • Cadmium
  • Copper
  • Antimony
  • Lead
  • Mercury
  • Uranium
  • Zinc
  • Selenium


  • Commercial and industrial treatment units for drinking water or contaminated water
  • Municipal water treatment
  • Carbon blocks
  • Cartridges for pitchers
  • Faucet mounted and counter top devices
  • Household point of entry treatment units

MetSorb® HMRG Adsorbent Specifications
HMRG Granular
Appearance White granules
Moisture Content <10%
Bulk Density 0.65 grams per cc (40 lb/ft3) milliliter
Other Free flowing
Particle Size -16+ 60 U.S. mesh (other sizes available)

Comparison of HMRG adsorbent with iron-based adsorbent.

Comparison of HMRG adsorbent with
iron-based adsorbent.

Treatment capacity as a function of tank size.

Testing was done under the conditions specified by the NSF Standard 53 for Arsenic. Results at a pH of 6.5 and a pH of 8.5 are shown in the graph above.

Lead removal by MetSorb® HMRG adsorbent in column test; 30 seconds EBCT.

Adsorption isotherms for lead between pH 5 and 7 are nearly identical.

The above graph shows the adsorption isotherm for Arsenic V at pH 8.5.
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