Crystallization can be used in the purification of electroplating baths, which are loosing their working efficiency due to the salt formation, and these salts can be withdrawn from the process as crystals though crystallization. As examples we can mention: Sulphuric acid iron pickling Hydrochloric acid iron pickling Carbonate removal in alkaline, cyanide, copper, zinc, brass.... baths. Waste chloride removal and recovery from processes