By combining the precipitate and adsorbing colloid flotation, a possibility for simultaneous removal of metal ions from aqueous solution containing copper, lead and zinc ions (25 ppm each) is investigated. Ferric chloride is used as coprecipitant. Potassium oleate is used as collector and for the improvement of precipitation, while extra coprecipitation of the ions still remaining in solution is realized via potassium ethyl xanthogenate, The test is carried out in the pH range of 4.0 to 10, Two cells are used for precipitate and adsorbing colloid flotation, differing in the way the gas bubbles are generated, i.e. dispersed-air and electrolytic flotation. The adsorption on colloid particles containing the precipitated metal ions is checked out by registration of surface tension at the liquid/gas interfaces both in the starting and purified solutions according to the method of Wilhelmy. The concentration of each heavy metal ion in the supernatant liquid is measured via ICP optical emission spectrometry. The amount of heavy metals coprecipitated with ferric chloride is determined from the difference in their concentration before and after coprecipitation, The optimal conditions under which copper, lead and zinc can removed almost quantitatively from aqueous solutions are found.