Marine Clean - Algae Cleaner does not work by killing algae. Its superb effectiveness is achieved through the Micriolysis process breaking the bond between the seaweed, algae etc. so that the released material can be rinsed away.
Marine Clean Marine Algae Cleaner is not a biocide and does not contain any ingredients prohibited by EU water substances legislation. It complies with California Proposition 65 the strictest chemical criteria in the world. No ingredient included in the product is considered a risk to the marine environment.
Use this link for the material data sheet: