The Haviland Durachlor Algae Kil CB 7.4 is a powerful algaecide that will efficiently destroy all types of algae in swimming pools. This effective copper based algae remover will work fast, but last long as well. It is safe for use on all pool surfaces, and it will also not stain those surfaces being treated. Use the Algae Kil CB 7.4 to ensure your pool is algae free and crystal clear for pool bathers to enjoy.