A concrete washout bin provides a contained, portable area to collect and neutralize concrete slurry

https://medium.com/@gunnignidf/right-size-your-site-choosing-the-best-concrete-washout-containers-for-any-project-a07dbea0fed3

A concrete washout bin provides a contained, portable area to collect and neutralize concrete slurry, preventing contamination of soil and waterways on construction sites.