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The title compound, 2C7H7N2+·C10H6O6S22−·3H2O, consists of two crystallographically independent benzimidazolium cations, two independent naphthalene-1,5-disulfonate dianions (both generated by inversion) and three water molecules. These components construct an infinite three-dimensional framework in the crystal structure via O—H...O and N—H...O hydrogen bonds.