The foam control depends ...

The foam control depends upon  process conditions such as Agitation, aeration, and other process conditions can also impact foam formation. Choosing right additives. Antifoams are added to prevent foam formation, while defoamers are used to break down existing foam. These additives work by destabilizing the foam structure, either by reducing the surface tension of the liquid or by disrupting the foam's film structure.Common Antifoam/Defoamer Ingredients are silicon and non-silicon based. Alcohol and Easters are also used. Temperature are also factor to reduce foaming.