In trial 2, a total of 18 overhead nozzles (total flow rate ¼ 34.2 L/min) was used, with 13 nozzles distributed over a 2-m long mesh belt, followed by a shaker table leading to a 1-m long mesh belt with an additional five overhead nozzles. PAA dosage was controlled in trial 1 by a Dosatron waterpowered dosing meter (Dosatron, Clearwater, FL), and in trial 2 by a ProMinent disinfection controller (ProMinent Fluid Controls, Inc., Pittsburgh, PA).