In general there are two different

In general there are two different rendering systems established worldwide. Depending on whether the animal fat is gained from an already dried material or from a wet phase, the systems are named dry and wet rendering, respectively. There is no general rule when and where wet or dry rendering is preferred, but it can be observed that wet rendering is mostly used where heat-sensitive, high-value products like fish oils, edible fats or poultry fats are produced