Revolutionary Rainwater Catching System Transforms Los Angeles

The video discusses the significant rainfall in Los Angeles and the subsequent water wastage, highlighting the city's reliance on imported water. Tree People, an environmental group, has initiated a project to capture rainwater using underground systems, starting with a large tank at a local school. This system filters out pollutants and has transformed the area into green spaces. The city is considering expanding these systems to save money and benefit the environment, showcasing a blend of ancient and modern water management techniques.

Describe how the filtration unit works in the rainwater management system.

What environmental benefits could a network of systems provide?