Barnacle Blaster Concentrate - 128oz Features: * Removes deposits on boat bottoms, scum line, and rust stains quickly and easily * Special ingredients to quickly remove barnacles and clean rust, oil stains, and algae * You've never seen anything like this! Barnacles begin to fall off the hull of the boat! * Requires minimal scrubbing * Will not harm fiberglass or gel coat * Can safely be recirculated through seawater cooling systems, dissolving barnacles, zebra mussels, calcium, rust, lime, and all other mineral deposits * Water-based, environmentally friendly formula * Special buffering process makes this product safer than other acid-based bottom cleaners