I had an algea problem this summer,early, and a man at Danbury Fish farm told me to put 1qt. cidekick and 1qt. hydrothol 191, and 1 gal. liquid cutirne + into a 25 gal. sprayer fill with water and spray the top of algea just enough to turn it the blue color. just enough to know that you have sprayed that area. It really worked for me and it wasn't a whole lot of chemical added to the lake. My lake was about 30-35 acres at that time, it's now about 40-45 acres and I haven't had any problem since then. however, after I got the algae problem under control, I began fertilizing to get a bloom. Seems to have worked.