Last summer was hot and dry, and we had an algae growth on the lake.  We called a company to treat the lake and they quoted $2,800 per year.  Michael did some research and found the Penn State website to be abundantly helpful.  One of the options that their website suggested was using barley straw as an alternative to expensive and toxic chemicals.  Frank located some barley straw, Adam donated it, and Nathan strung a rope across the lake and attached the straw bales. Thanks everyone for all your help.