An algaecide or algicide is a biocide used for killing and preventing the growth of algae. ==Natural algicides== Barley straw, in England, is placed in mesh bags and floated in fish ponds or water gardens to help reduce algal growth without harming pond plants and animals. Barley straw has not been approved by the United States Environmental Prote... Found on http://en.wikipedia.org/wiki/Algaecide
Swimming pool chemistry: Meaning: to kill algae. Algaecides perform best as a backup to a routine sanitation program. They also help to kill airborne spores as they blow into the pool. A variety of algae treatment products are available including copper and silver compounds, poly-quat compounds, chlorine enhancers , and herbicides.
Found on http://www.1st-direct.com/acatalog/Chemical_Glossary.html