Water purification plants are chemical-physical systems that allow chemical-organic and inorganic impurities to be retained. This type of plant is connected in a ‘closed cycle’ to the washing tanks of galvanic plants. Thanks to this connection, water contaminated by runoff from galvanic baths is purified through these plants using special ‘ion exchange’ resins and activated carbon, which are able to retain polluting particles and release water that is not harmful to subsequent processes. In addition to the above systems, the Pontassieve-based company is also able to manufacture ultra-demineralisation systems for rinsing, which precede the hot air drying systems integrated with reverse osmosis.