We have a variety of pond algae control products some which are designed for small, backyard ponds and those for larger fish ponds and lakes. We also have a Pond Algae Control guide for more information.
Pond algae needs sunlight and nutrients to grow. Aquatic sunblockers block the sunlight by using a special pond dye which colors the water. The nutrients come from fallen leaves, fish wastes, sludge, muck, etc. You want to do everything you can to reduce the nutrients in the pond. Use a good beneficial pond bacteria that will naturally eat up those wastes. The best bacteria product for large ponds and lakes is our PlanktoniX Pond Bacteria. You an use a variety of Microbe Lift products for small ponds.
We also have pond algaecides that kill pond algae and other aquatic herbicides that kill pond weeds.