Recently, the second-grade students have been focusing a lot on the topic of water. We are trying to learn as much as possible about its properties, as well as ways to save and reuse water, aware that it may one day run out. As part of these activities, we visited the Warsaw Waterworks, where experts told us about Wielka Kaśka and Chudy Wojtek. We had the opportunity to test the hardness of the water, learn about the water treatment process, and also find out that Warsaw’s tap water is safe to drink!