Abstract: The invention relates to a well (1) for extracting, observing and/or lowering ground water, comprising a standpipe (2) having at least one filter pipe area (3) and comprising at least one pump (6) located in the standpipe (3), in order to provide a well which can be regenerated simply and inexpensively, the invention provides that associated with the filter pipe area (3) is a spraying device (9) for spraying the filter pipe area (3) and/or the well area adjacent to the filter pipe area (3) and that the spraying device (9) is connected to at least one pressure line (10) to supply the spraying device (10) with a medium to be sprayed.