1-(2-Ammonio-eth-yl)piperazin-1,4-diium dihydrogeno-phosphate monohydrogeno-phosphate.

The structure of the title compound, C(6)H(18)N(3)·HPO(4)·H(2)PO(4), is characterized by two kinds of inorganic chains running along the a-axis direction. The first one is composed of HPO(4) (2-) anions, while the second one is built up by H(2)PO(4) (-) anions. Both types of chains are held together by O-H⋯O hydrogen bonds. The organic cations are attached to these chains through N-H⋯O and C-H⋯O hydrogen bonds. The piperazin-1,4-diium ring adopts a chair conformation.