Suport Gravel

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.
The chemical content is less than 0.0001% of the following: arsenic, cadmium, chlomium, cyanide, copper, nickel, lead, zinc and mercury.
AWWA Standard B100-01 and NSF Standard 61 approved.

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%