Superior filtration media Alamo's Micro-Z granular filter media outperforms conventional multimedia materials due its unique structure, allowing particulate to penetrate deeply into the filter bed to provide superior filtration at increased flow rates. Physical Properties Color Light Green Bulk Density 55 lbs. per cu. ft. Specific Gravity 2.2 gm/cc Mesh Size 14x40 Uniform coefficient 1.9 Hardness (Mohs scale) 4 Features Benefits Higher solids loading capability Superior filtration performance Reduced backwash frequency Removes finer particles Reduces pressure drop Provides higher flow rates Light weight Reduces shipping cost Easy to handle Conditions of operation Recommended bed depth 36" - 48" Recommended freeboard 50% of bed depth Service flow rate 12-20 GPM/sq. ft. Backwash flow rate 12-16 GPM/sq. ft. Backwash bed expansion 30-40 percent Note: Allow bed to soak overnight before initial backwash MICRO-Z vs. Conventional Filter Media Media Nominal Micron Rating Loading Capacity Sand 20 1.0X Sand Anthracite 15 1.4X Multimedia 12 1.6X Micro-Z 5 2.8X