This filter element is special for removing the impurity and water from the oil. It adopts the special fibre materials which can dewater. It is very suitable for removing mass water from the oil (it can purify the oil which water content is 30%). There are two kinds filter elements, one is Coalescer filter element which mainly congregate the water molecule, making the water molecule to a liguid water, then the separator filter element separate the liquid water from the oil.