The students working on the project "Clean Water - Spring for Life" No. 174497067630969, together with the teachers Ms. Temenuzhka Hristova, Mr. Hristo Petkov, Ms. Rositsa Tsenova and Mr. Todor Vassilev, conducted the first practical activities and sampling from various water sources. The classes turned out to be more than enjoyable and useful. The students took on the role of not only chemists, biologists and physicists