Smoke Fluid Systems from Superior Signal are used to find faults and sources of surface water inflow in collections systems. Smoke fluid is both high-quality and economically priced. Blowers are engineered for smoke testing, using a double-insulated heating chamber with stainless steel injector to maximize dry smoke output and produce quality, liquid-based smoke. Blowers can be configured to work with Superior Smoke Candles. 800-945-8378; www.superiorsignal.com.