Tetra Tech developed the original Activated Sludge Troubleshooting Chart to present a clear, systematic approach to defining the nature of activated sludge control problems to determine appropriate actions for achieving more favorable plant operation.

The second edition of this classic operators’ aid uses a more readable format and includes eleven additional conditions not addressed in the original chart. The 24” x 36” poster is now laminated, equipped with a dry-erase pen, and accompanied by a searchable digital manual in CD format.

Activated Sludge Troubleshooting Chart