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FIGURE 1. Schematic diagram of the water recycling fish culture system that incorporated a granular carbon <br />biofilter and pretreatment of the water with ozone (not drawn to scale). The design included a fish tank (A), <br />pump {B), valve (C), ozone water contactor (D), point of ozone injection (E), sedimentation tank (F), <br />mechanical filter (G), sampling port (H), granular carbon column (I), ozone generator (J), and oxygen <br />canister (K). <br /> <br />