There are standards to designing the aeration chamber or reactor in a STP and most of the suppliers try to follow these standards unless they are STPs proprietary claims. On the other hand there is no standards available to design collection tanks, equalisation tanks, treated water tanks. Apart from the tanks design each vendor chooses to give his own choice of pumps, aeration systems and equipments. It is also very common that consultants emphasize on design and vendors are used as material suppliers. Often so it is true that the fundamental parameters used in the design is also wrong.All these factors put together, there is many possibilities for wrong design, inadequate choice of equipment, etc, leading to many failures in plant operation. EcoTec professionals ask you the right questions to give you the right design, resulting in very few non performing plants.