2,2'-(Piperazine-1,4-di-yl)diethanaminium bis-(2-hy-droxy-benzoate).

The asymmetric unit of the title salt, C(8)H(22)N(4) (2+)·2C(7)H(5)O(3) (-), comprises half a 2,2'-(piperazine-1,4-di-yl)diethan-aminium dication plus a 2-hy-droxy-benzoate anion. In the crystal, the anions and cations are linked by N-H⋯O and O-H⋯O hydrogen bonds to form infinite two-dimensional networks parallel with the a unit-cell face. The conformation adopted by the cation in the crystal is very similar to that adopted by the same cation in the structures of the nitrate and tetra-hydrogen penta-borate salts.