Envirosight’s free guide to sewer inspection and maintenance serves as an introduction for industry newcomers. Sewer Maintenance 101: The Quick and the Dirty Guide to Sewer Inspection and Upkeep provides an overview of how a sewer system functions, how it’s inspected and how it’s maintained. It can serve as a tool for industry orientation or provide a refresher to employees already in the industry. 866-936-8476; www.envirosight.com.