Keep your swimming pool clean, clear and algae-free with Blue Waves premium Concentrated Algaecide! Algae growth is common when your pool has poor circulation and when the disinfectant level or algaecide content in the water is low or neglected. This super concentrated algaecide goes a long way to killing and preventing all types of algae in your swimming pool. The non-metallic, non-staining formula is great for all pool types and will not discolor hair.