Does Backwash Really Happen?
![Young girl shows water bottle dyed green from the food coloring in her mouth](https://wpsu.psu.edu/wp-content/uploads/2016/12/backwash.jpg)
Try it yourself with step-by-step instructions and guided scientific questions available in the downloadable student handout.
Try it yourself with step-by-step instructions and guided scientific questions available in the downloadable student handout.