Our department welcomed newly registered environmental engineering students with a tailored presentation, followed by an experiment on contaminant removal, in order to introduce them to the work of environmental engineers. Organized into teams of five, the students used a porous structure to remove methylene blue from water and observed the enhanced adsorption efficiency of activated carbon compared to a natural sand bed. This hands-on activity provided them with the opportunity to explore the flow phenomenon in porous media, the concept of flow control, and the water treatment process through team interaction.