When using fuels or other fluids, it is essential that they are free from particulate contamination and free water.If the fluid does not meet the required cleanliness standards , fouling and corrosion of the equipment downstream may occur, leading to expensive maintenance costs and reduced component life . In today's environment , is also necessary to recover and recycle the waste fluids from the process . A coalescer isa device for separating immiscible liquids or liquids fro a gas stream.