Water at the EnerSys Tijuana plant is supplied by the Public Utilities Commission of Tijuana. Prior to the project, once the water was used, it was treated through a microfiltration process in accordance with strict standards and then discharged into the city sewer. The water reuse project introduced additional filtration steps to this process, which purified the water to a level approved by the local Public Utilities Commission for reuse as a replacement for city water for limited uses. The filtered water, once it has passed through the advanced filtration system, can be reused in the plant before it is discharged into the city sewer. Sanitary services, specifically toilet usage, that had previously been using city water now uses this recycled water.