21 22 are in the form of clip like clamps each including two mirror reversed clamping legs 24 and 25 for use the support bracket is assembled with the dry concentrate bag 1 as shown in fig1 wherein the two clamping legs 24 25 of the upper and the lower support legs 21 22 extend around the neck portions 19 of each connecting element 12 so as to engage the connecting elements 12 underneath the radial disc like flange 16 for firm engagement therewith the rigid support bracket 1 then holds the attached bag 1 in a stretched position so that the upper and lower connecting elements of the bag both are identical are supported at a predetermined distance the support structure 3 of the dialysis apparatus includes a pivotable upper part 3 u2032 which is shown in fig1 by dashed lines in an open position upon placement of the support bracket 2 including the bag 1 onto the support structure 3 of the dialysis apparatus and downward tilting of the upper part 3 u2032 the bag 1 with the support bracket 2 is firmly engaged in the support structure 3 at the same time the closure membranes 17 of the two connecting elements are pierced by piercing members disposed in the support members of the dialysis apparatus as the connecting elements are firmly engaged and positioned by the bracket 2 they cannot yield while the axial force required for piercing the closure membrane and for providing the sealing connecting between the connecting elements and the support members of the dialysis apparatus is applied 0025 fig6 shows another embodiment of the support bracket with a dry concentrate bag 1 mounted therein wherein the support bracket 2 u2032 has a tubular a box.