... , capturing oil, bacteria, algae, reducing COD, BOD and heavy metal.5. Low corrosion. Working pH range 4-11, with best performance ... . Sometimes slight precipitation may occur depending on the water used.5. Keep close attention to the progress of the application which ... . In the sample test, stir at 20-30r/min for 5 min, stand for 10 min, and test turbidity. 6. Compulsive filtration ...