This report describes the use of the acid-stabilized ionic copper formulation called EarthTec QZ to treat an entire lake heavily infested with quagga mussels for the purpose of eradicating the invasive species. This is the first recorded instance of a lake-wide eradication effort of quagga mussels and is also the largest and deepest lake known to have been the subject of an effort to completely eradicate either quagga or zebra mussels.
A 60-million-gallon-per-day water treatment plant in the Midwestern United States uses EarthTec QZ to keep its intake structure and a 4.5-mile, 92-inch pipeline clear of zebra mussels.
A pilot study conducted at a Toronto drinking water treatment plant found that ionic copper is more effective than chlorine for controlling adult and larval dreissenid mussels.
The USGS is studying zebra mussel control in Lake Minnetonka, Minnesota. The project is a collaboration with the University of Minnesota Aquatic Invasive Species Research Center. If successful, the treatment could provide a blueprint for protecting other lakes infested with zebra mussels.