Fins,
The best way is to use the application rates suggested by the company. We at ATI have had good success using liquid copper at 5 gallons/treatment acre.
**NOTE: DO NOT TREAT MORE THAN 1/2 OF THE LAKE PER TREATEMENT OR YOU HAVE A VERY GOOD CHANCE OF KILLING YOUR FISH** To get your perimeter treatment acres: Treatment perimeter x treatment width / 43,560.
To get your Total Treatment Surace Acres: Entire length x entire width / 43560
If you choose to use the granulated CuSO4, do not exceed .015lbs / perimeter feet. And, again, do not treat more than 1/2 of your lake at a time.