A material moving system with continuous operation delivers the parts along the pretreatment line, between the spray rings of the zones. The chemical or rinsing liquid for the treatment will be led to the parts from the technological tanks under the zones through spray rings by means of pumps. The plant has a self-supporting construction. The tanks under the zones have also a supporting function. We recommend these tanks for simpler parts which can be hanged up easily. Advantages: - higher mechanical cleaning efficiency - energy- and cost-efficient process The plant is a closed tunnel, made from self-supporting construction. The parts move between spray nozzles, as a consequence, the adequate cleaning can be ensured. Generally in use for medium or higher capacities, similar serial products. Environment-friendly, energy-efficient and investment-friendly. Our company builds continuous plants from stainless steel or mixed polypropylene - stainless steel constructions.