Lecture of Vladimir GONCHARUK, who is the Director of the Institute of Colloid Chemistry and Water Chemistry (http://iccwc.org.ua/). The lecture tells about facts of water pollution and ways to control various pollutants. The speaker raises a question of rational purification and water treatment. The lecture gives extensive material on water properties, on characteristics of various pollutants. Vladimir GONCHARUK tells about many interesting approaches realized in the Institute.