What happens to the water when we brush and flush? Objective Students will: Learn the process of water treatment Discuss the various amounts of water used in everyday activities Learn strategies for conserving water View and discuss river conditions Test river water with basic water testing kit Background During water treatment, 60% of suspended solids are removed. Since we often let the water run as we complete our daily routines, much of the water is already clean when it goes down the drain. Less than 1% of wastewater is actually waste. Machines remove human waste, gravel, sand, oils, greas Duration: 60 Minutes.