Just ran accross this site today: http://www.algaecontrol.us/information.htm

Anyone know how well they work and if there is much legitimacy to their claims of " The method is not revolutionary technology. It was discovered decades ago that ultrasound would destroy algae cells. However, at the time of the discovery, ultrasonic wave generators were too costly to make it a marketable product. But today, underwater ultrasonic sound wave generation that is inaudible to and no threat to people, animals, fish or plants is now available and affordable for those who want to get rid of algae and other harmful micro-organisms such as destructive root parasitic fungi, Fusarium and Pythium.

And does anyone know how much they cost? can't find the prices in their web.

Last edited by KGP; 06/30/08 12:27 PM.