Apparatus (2) for removing and collecting fouling from a submerged structure (11； 12； 13； 14). The apparatus (2) includes: - a pump； - a treatment unit (28) for collecting a material from a discharge water； - a discharge channel (27) between the outlet of the pump and the treatment unit (28)； and - a means for moving the mouthpiece (21) along the submerged structure (11； 12； 13； 14), the inlet of the pump being in fluid communication with the outlet portion (215) of the mouthpiece (21). A method for using the apparatus (2) is described as well.
