You cannot see it, smell, or taste it. But lead in drinking water can be toxic, especially to children. The San Diego Unified School District has a new way to deal with this growing concern with its clean water program.

At Clay Elementary School Tuesday, the San Diego Unified showed off its proposed solution to the problem: Filtered water hydration systems installed in all the district’s schools.

The filtered water flows from either the drinking fountain or the tap above it, which is designed for filling up a water bottle. Laura Deehan is a public health advocate with California Public Interest Group (CALPIRG). She urges schools across the state to follow this model.