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This extremely high dose was tested to show what a failure looks like (the turbidity is greater than 1 NTU). The While the effluent turbidity is much higher than oneaverages less than 1 NTU, there are many spikes above this acceptable value for all capture velocities, meaning this is a good demonstration of failure.
This overdose failed because the floc blanket was not effective because the flocs that form with an overdose are larger and "fluffier" than they would be with normal dosing, forming a less dense floc blanket that cannot effectively trap flocs and filter. As a result, the effluent turbidity is higher and the system fails to clean the water fully enough.