A8037-01 Garnet #30-40 (0.38 Cu/Ft Bag)
• Color: Light tan to reddish purple
• Type: Almandite
• Crystal System: Cubic
• Hardness: 7.0-7.5 (Mohs scale)
• Bulk Density:
#30-40 Garnet: 130 lbs./cu. ft.
• Effective Size:
#30-40 Garnet: 0.35 mm
• Uniformity Coefficienty:
#30-40 Garnet: 1.4
• Free Silica: Minimal
• Acid Solubility: Minimal
Called multi-media or mixed media filtration, the high density, small grain size of Clack #30-40 Garnet solves a major filtration problem. In a single media granular filter such as a sand filter, the material will hydraulically classify during backwash according to granule size, the smallest rising to the top. When water flows downward through the sand, the fine particles at the top of the bed do most of the straining of the sediment. The solids form a cake on the surface with filtration typically taking place in the top few inches. As the cake forms, the filtration becomes finer and the head loss increases exponentially with time.