Smart Sponge Plus features an antimicrobial agent chemically and permanently bound in a proprietary process to the Smart Sponge polymer surface. It destroys bacteria such as enterococcus, Escherichia coli and fecal coliforms, while also attracting and encapsulating oils and other hydrocarbons. Fits most catch basins and curb inlets. Multiple shapes and configurations make Smart Sponge effective as Passive Skimmers, Bilge Skimmers, Line skimmers, etc. Please click on SMART SPONGE to view our demo tape of how it works.