Abstract: A filter for filtering water includes a compound material installed between the upper supporting seat and the lower supporting seat; the compound material being formed with an high density fiber layer, an active carbon layer surrounding the high density fiber layer and a fiber layer surrounding the active carbon layer; the upper supporting seat having a cover plate, an inner ring, an middle ring and an outer ring; the lower supporting seat having a cover plate; an inner ring; a middle ring and an outer ring; the high density fiber layer being installed between the platforms of the upper and lower supporting seat; the active carbon layer being installed between the fiber filtering material of the upper supporting seat and the fiber filtering material of the lower supporting seat; and the fiber layer being installed between the upper and lower supporting seat.