EarthTec QZ is an EPA-registered molluscicide for prevention and control of quagga and zebra mussels. EarthTec QZ’s unique liquid formulation is proven effective at killing adult mussels and preventing settlement and infestation by larval-stage veligers.

From: “Efficacy of Copper Based Algaecides for Control of Quagga and Zebra Mussels,” 2013, a report for the California Department of Water Resources by Renata Claudi

Figure 22. Zebra mussel mortality when exposed to EarthTec QZ for 96 hours.

Figure 43. Average percent mortality after 96 hours of exposure to low concentration of algaecides.