Support Gravel

nfm_products_gravel3NWP-SG-box-165x165All of Northern’s Gravel has been formed from a natural glacial deposit formed millions of years ago along the Mississippi River Valley. Northern Filter Media resource is comprised of over 500 acres of sand and gravel to a depth of 110 feet.

Support gravel, the lower strata of a filter bed, acts to support the filter medium. The maximum efficiency, the support gravel must possess the necessary attributes of hardness and be rounded or non-angular. Correct gradation and sizing must be calculated to properly support the filter media.

Once dredged, the gravel is sized to your specifications by sending it over a series of vibrating wet screens to in sure the cleanest product possible.

The chemical content is less than 0.0001% of the following: arsenic, cadmium, chlomium, cyanide, copper, nickel, lead, zinc and mercury.

Northern’s Suppert Gravel is AWWA B100-09 approved and certified under NSF (ANSI) Standard 61.

Physical Characteristics

  • Color: multi-color
  • Bulk Density: 100 lbs./cu. ft.
  • Specific Gravity: 2.65+
  • Mesh Size: 2.5 in. x 3 mm
  • Hardness: 7.0 (Mohs scale)

Chemical Breakdown

  • Acid Solubility: 1.7%
  • Porosity: 38.35
  • Loss on ignition: 0.69%
  • 24-hour absorption: 0.48%
Download Support Gravel MSDS