The use of a blue or black dye to shade out UV rays thus reducing the light source for weed and algae growth.
In an effort to reduce excessive weed growth and algae blooms, several lakes have had success with Blue Dye. The dye blocks UV light, shading the lake and reducing the photosynthesis necessary for plants and algae. Blue Dye is typically dosed in the spring, with a booster application in the summer if needed. The lake will get a “tint” of blue coloring which some will find appealing; others will call it “fake” blue coloring. The dye is food grade, which should answer most swimmers’ concerns. This approach is just another means by which we can minimize or avoid our dependence on copper sulfate. Check with your lake treatment vendors for proper dosage per acre. This approach has been successful at Cupsaw Lake, Erskine Lake, Wallkill Lake, and Lake Arrowhead.
Alan Fedeli, Chairman of Cupsaw Environmental Committee and NJCOLA board member