The woosh is simply the high volume flow of water that will carry out solids. It is independent of which valve is opened first ( inside or outside). The last one opened creates a high volume flow. The problem with the 3/4" line is just will not allow the high volume flow required. Don't get too small of a tote. The last thing you want is to have the tote fill up before the toilet is empty as there is no easy way to stop the flow without spillage somewhere.
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