The tube flocculator was constructed in the summer of 2008. To prevent flocs from settling in the tube flocculator is arranged in a vertical figure-eight. The flocculator has the same configuration and dimensions as the lab flocculator. FReTA will be constructed at the plant in Fall of 2008. FReTA measures the rate of change in turbidity as opposed just measuring the turbidity at a specific point in the flocculator. This is advantageous because the the change in turbidity rate is comparable to the settling velocity.