Ethane-1,2-diaminium bis-{5-[4-(1H-tetra-zol-5-yl)phen-yl]tetra-zolide} dihydrate.

In the two anions of the title salt, C(2)H(10)N(2) (2+)·2C(8)H(5)N(8) (-)·2H(2)O, the central aromatic rings make dihedral angles of 13.53†(6) and 6.53†(7)° with the deprotonated tetra-zole rings, and 11.39†(6) and 10.41†(9)° with the other tetra-zole groups. In the crystal, the cations, anions and water mol-ecules are linked by an extensive O-H⋯N, N-H⋯O and N-H⋯N hydrogen-bond network into two-dimensional wave-like duplex sheets extending parallel to the bc plane. π-π stacking inter-actions between benzene rings [inter-centroid distances are 3.8482†(4) and 3.9621†(5)†à ] and between tetra-zole rings [inter-centroid distances are 3.4350†(4) and 3.7169†(4)†à ] further consolidate the crystal structure.