The first group made their own filters. They started planing their work, and they built homemade water filters. They also picked up sand and gravel from a beach.

The second group worked in a pickup point for plastic bottles, so all the students could collaborate on the making of the filters.

The third group made posters against contamination, and pollution. They also worked in a poster on how to make homemade water filters.

The fourth group planned what to do with the plastic bottles we have left. They thought about how to recycle the plastic, and they wanted to spread their ideas about it.