The demineralization recycling plant of 25 liters in two columns is an essential complement to achieve good galvanic results. It is generally applied to the washing tanks of the galvanic systems so as to create a closed circuit with discharge “zero”. It then allows to obtain, without waste, water always purified of all residues of galvanic processes. These waters “purified” allow a perfect washing of the pieces by increasing, as a result, the duration of the subsequent galvanic baths and maintaining a constant quality of the product. The demineralization plants of Doit Industries are compact and can be placed in small spaces near the production lines.