Emphasis in research and development of new processes has been placed from the beginning on the cost-effective treatment of the sludges produced by the exeptional dewatering effect of electroflotation. Besides the cost-saving method of further dewatering by means of filter presses, the company has realized a new process for chemical-thermal treatment of sludge, produced by treating industrial waste water. This new method can remove e.g. oil from sludge completely with less than 1% of water. On the other hand, metal salts, like aluminium sulphate and iron chloride applied for treatment of industrial waste water can be recovered and reused again for flocculation.