Barnacle Blaster Concentrate - 32ozFeatures:Removes deposits on boat bottoms, scum line and rust stains quickly and easilySpecial ingredients to quickly remove barnacles and clean rust, oil stains and algaeYou've never seen anything like this! Barnacles literally begin to fall off the hull of the boat!Requires very little scrubbingWill not harm fiberglass or gel coatCan safely be recirculated through sea water cooling systems, dissolving barnacles, zebra mussels, calcium, rust, lime and all other mineral depositsWater based, environmentally friendly formulaSpecial buffering process makes this product safer than other acid-based bottom cleaners