Cutrine Plus Granular Algaecide is a fast-acting, 3.7% chelated copper algae killer designed for effective pond and lake algae control. Perfect for targeting bottom-growing algae such as Chara and Nitella, this granular formulation delivers powerful results for spot treatments along docks, swimming areas, boat launches, and fishing zones. It works quickly—controlling planktonic algae within 24–48 hours and filamentous algae in 3–4 days—by breaking down the algae’s cellular structure and disrupting photosynthesis.

Safe and versatile, Cutrine Plus Granular is EPA-registered for use in lakes, reservoirs, farm and fish ponds, hatcheries, and golf course water hazards. Treated water can be used immediately for swimming, fishing, livestock, and irrigation, making it one of the most trusted pond algae treatments available. For best results, apply early in the season at a rate of 1 lb per 750 sq ft (60 lbs per surface acre), spreading evenly over the affected area. Always treat only one-third to one-half of your pond at a time to avoid oxygen depletion.

Powerful yet safe for aquatic life, Cutrine Plus Granular Algaecide provides long-lasting bottom algae control and helps restore clear, healthy water. Ideal for pond owners and lake managers looking for an effective copper-based algae killer that prevents regrowth and maintains beautiful, algae-free water all season long.

Cannot Ship to: AK, CA, CT, DE, HI, NH, NJ, NY, ME, MD, MA, OR, RI, WA, VT or Canada