The title cobalt complex (C₁₀H₃₈Co₂O₂₆) consists of [Co(H₂O)₄(C₁₀H₂O₈)]^2-_n anionic chains, balanced by [(Co(H₂O)₆]²+ cations and eight solvato water molecules, some of which are disordered. The chains are formed by Co(H₂O)₄ “beads” threaded by fully deprotonated benzenecarboxylato anions binding in a stretched, trans fashion, and they are linked by H-bonds into a 2D structure. The cationic groups and solvato water molecules form a second kind of 2D arrays, “sanwiched” by the latter ones and linking the lot into a 3D structure through a very complex H-bonding interaction scheme. The structure presents a very conspicuous pseudo symmetry, and it appears to be a slight polymorphic modification of an already published isologue of identical formulation but with the higher symmetry properly attained, in a volume half as large. The slight differences between both structures seems to reside mainly in the (disordered) solvates, as suggested by the overlap of both models.