The open drainage system for the separation of waste water is carried out using water centrifuges. This separates oil and solids from oily waste water and the waste water passes through the CleanFlow filters. The CleanFlow filters are necessary because oily waste water is still present and waste water may not be thrown overboard because it still contains too much oil. So the oil absorption filters are a necessity to place behind the centrifuges. This unit is for a Central Processing Facility (CPF) Australia.