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This semester I was a member of the Depth v.s Sand Filtration team. Our goal for the semester was to understand the differences between depth and surface filtration and the parameters that determine which type of filtration occurs. We first did a literature search of existing research before designing a system to mimic both typical downflow filtration and the subsurface injection process used in AguaClara filters. . Once we constructed our apparatus we did several experiments in which we varied parameters such as flow velocity, influent turbidity, and coagulant dosage.