Smoke Testing from Superior Signal can effectively help find cross-connected sewer lines and other sources of surface inflow causing wet-weather sanitary sewer overflows. Smoke candles provide visible smoke to detect more faults and at a longer distance. It is a fast, easy and inexpensive way to find leaks and faults in any type of collections system, with generators available in sizes to meet any need, from 30 to 500,000 cubic feet. 800-945-8378; www.superiorsignal.com.