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That distinction matters because of how these topics get written

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9.1 Alternative Media and Biofilter Design While traditional BAC systems use granular activated carbon (GAC), ongoing research explores alternative media and filter configurations for greater contaminant removal or reduced maintenance: Anthracite and Sand Blends: Some systems incorporate layers of anthracite or sand to improve suspended solids removal and reduce media fouling, particularly in high-turbidity source waters

Insert the needle at the correct angle, inject slowly, then remove and dispose of it safely