Wastewater from the textile industry is characterized by a varying and often unidentified composition. The basic contaminants normally present include surfactants, organic and mineral acids, bleachers and dyes. These substances deteriorate the quality of the water downstream via direct contamination and through the occurrence of secondary processes. The use of reagent treatment methods does not always lead to sufficient purification. Therefore, a study on reagent precipitation of reactive dyes in wastewater was carried out, and as a second step the method of reagent ultrafiltration separation of the dyes was employed. The effectiveness of the combination of the two methods was shown.