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In the title compound, 2C3H7N6+·C4H4O62−·2H2O, in which the complete anion is generated by crystallographic twofold symmetry, there are O—H...O, N—H...O and N—H...N hydrogen-bonding interactions between neighbouring moieties, forming layers parallel to the bc plane. In addition, π–π contacts [centroid–centroid distance = 3.6541 (9) Å] between the six-membered rings of the melamine cations are observed.