By Anne Mengden, Science Teacher
The Long Ridge School, Stamford, Connecticut
Children in grades 4 and 5 are studying freshwater ecology with a focus on the Mianus River, which provides drinking water for 150,000 people in Fairfield County, CT and Westchester County, NY. The children were learning about the water treatment process that converts raw water into potable water. Anne Mengden, LRS science teacher, introduced the filtration process, an important step in water treatment. The pupils were offered orange juice that contained extra pulp. Since they preferred pulp-free orange juice, they were challenged to figure out how to filter the pulp out. Students designed their own filters using a funnel and different materials such as paper towels, cotton balls, and screening and eventually succeeded. “Are you sure there’s no more pulp left?” One child inspected the juice with a magnifier and proclaimed that it was “safe to drink.” The children announced it was the best orange juice they had ever tasted! They won’t forget their hands-on lesson in filtration.