Proper filtration and regular use of Blue Wave® pool algaecide will keep your pool free of algae. 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. Blue Wave® offers concentrated algaecides to fight all strains of green, yellow, black, and mustard algae. Not only do they kill existing algae, but they will also prevent the formation of those tough, resistant algae.