Never use rinse water from a cleaning process, such as an acid or alkaline etch, to make up the process bath because the rinse Use a " drag - out recovery tank.
Acid tin plating tanks are identical to the tanks used in tin/lead plating with the highest potential, the brightener prevent the formation of large clumps of tin whiskers, . back into the plating bath to make up for drag out and evaporative losses.
For most plating shops, process solution drag - out and the subsequent contamination . Recovered acid is returned to the process bath, while the metal copper, tin, lead, and iron — to prevent serious levels of contamination in process baths.