Investigations on the filtration of natural aquatic suspensions supported by dosing small amounts of Fe(III)-salts (gFe h 0.1 mg.L-1): mode of action and basic design criteria.

Reports on the improved removal of particles during the treatment of natural aquatic suspensions has been achieved by pre-ozonation and the addition of small quantities of iron salts followed by rapid filtration. Evidence shown by investigations on a large-scale installation at Lake Constance Water Supply, this procedure reliably reduces suspended solids by at least 2-3 powers of ten in long-term use.