The performance of a process depends on the useful life of coating baths, which is reduced by the formation of complexes or undesirable products.

The used coating baths are processed in the plant or are stored in tanks and then disposed or treated in another plant. The volume of the produced waste and the baths replacement cost can be minimised applying the following techniques:

Filtration: The filtration of the sewages from coating leads to the removal of the solid components, resulting in the extension of the baths' life.

Liquid refilling: Instead of getting rid of the bath's liquid, it can be refilled with fresh water and chemical components, until the concentration of undesirable substances in the bath become high enough.

Electrolytic removal of undesirable components: A small loss of the coating metals (nickel, zinc) is observed but it is insignificant compared with to profits that results from the extension of the coating bath's life.

Solids' sedimentation: Metals such as lead and cadmium are usually met as impurities of anodes and they can be removed with sedimentation.

Recording and controlling the solution parameters: The continuous analysis of the coating bath parameter (eg pH, concentrations of chemicals and metals, etc.), contributes in the knowgledge of the needs of chemicals components or in the removal of undesirable substances. In this way the required control can be achieved.

Supply of clean anodes: The undesirable substances that are contained on the anodes can cause the pollution of the coating bath.