A fluid treatment module comprises a fluid inlet for non-treated fluid and a fluid outlet for treated fluid, a fluid treatment element comprising a body of a fluid treatment medium with first and second faces positioned at opposite sides of the body, the body comprising channels extending from the first face to the second face channels of a first type open at one end at the first face and closed at the other end adjacent the second face channels of a second type open at one end at the second face, and closed at the other end adjacent the first face, wherein channels of the first type are separated from channels of the second type by the treatment medium, one of the types of channels receiving non-treated fluid and communicating with the inlet, the other one of the types of channels collecting treated fluid and communicating with the outlet.