slide baskets 13a 13b and the treatment solution the floor structure of the apparatus is denoted by 27 and elevations of the floor structure by which the position of the treatment containers 6 is established are denoted by 27a 27b to take the slide baskets 13a 13b out of one treatment station 5 and for the transportation of these slide baskets to the next treatment station the transport device again travels to the position of the treatment container 6 the vertical slider 11 is thereby lowered until the magnets 15a 15b arranged on the vertical slider 11 come into contact with the cover shaped portion 17 of the transport unit through the holes of the cover plate 16 the electromagnets 15a 15b are subsequently switched on again and the transport unit together with the baskets 13a 13b suspended on the cover plate 16 are raised out of the treatment container 6 the pivoting unit 19 is then pivoted further downward by turning the drive roller 21 to the right so that the suction underlay 26 is pivoted in between the slide baskets 13a 13b and the treatment container 6 this position is detected by the second microswitch and when it responds the turning of the drive roller 21 to the right is stopped in a following step the slider 11 with the slide baskets 13a 13b is caused to travel vertically downward far enough for the suction underlay 26 to come into contact with the lower edge of the slide baskets 13a 13b residues of liquid that run out of the slide baskets are received by the suction underlay 26 by.