Here’s some bitchen science…
This animated sequence posted by Pilot Projects shows a concept of bio-remediation with the use of 40 shipping containers sitting in the Gowanus Canal. The plan called Modular Floodplain covers the shipping container with plants and soil, which would filter (meaning help to clean) the Gowanus Canal.

This design won Honorable Mention for Urban Ecology in Water_Works Competition from Gowanus by Design.