During which step is an aeration tank used? 
Definitions:
Arguments
The values or parameters that are passed to functions, procedures, or commands in programming and scripts.
Action
In computing, an operation initiated by a user or program, which causes a reaction by the system or software.
Macro
A set of commands or actions bundled together to automate repetitive tasks in software applications, different from its design view aspects.
Recording
The act of capturing audio, video, or digital events for playback or analysis.
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