has been found to leave a certain amount of impurities from precipitants and dyestuffs, and in some cases surplus precipitants, in the water phase. This would increase the need for fresh water renewal in case of recirculation or require a secondary treatment, e.g., using activated car bon. Flotation, filtration, and centrifugation have been tested for separation of precipitates[8], and a water quality of 2-3 mg/l of suspended solids can be achieved in first step separation by all techniques. An extra polish may be necessary for the reuse of the water.