Cutrine-Plus Aquatic Algaecide - 2.5 Gallon Liquid Copper Formula for Planktonic and Filamentous Algae - Fast-Acting, Double-Chelated for Hard Water - Used by Pros in Ponds, Lakes, Canals and Reservoirs

Works great. And doesn’t hurt the fish.

Used this with plexmate surfactant to kill algae. Gone in 24-48 hours. Works great.

I’m updating the review in this because the product took a little longer to work but our pond looks amazing after two week and only half the container

Have used this product twice on a one acre pond with depths of up to 15 feet. Took out the algae “scum” within a week. Amazing.

We have a 2 acre pond that developed a serious filamentous algae problem this spring due to all of the fertilizer run off from surround fields. About 40% of our pond became covered with thick mats of algae when the temps reached 85 - 90. I have a 15 gallon sprayer that will spray out about 30 feet and was told to mix at the rate of 1 gal Cutrine to 9 gal of water. I also mixed in 22 oz of Cygnet Plus as a surfactant and sprayed along the shoreline and used a a jon boat to spray the rest of the pond out in the center. The first time I sprayed the algae was dead within 24 hrs, however I've needed to reapply whenever I see regrowth. But the product works well. While it didn't bother our turtles and fish I was told that Koi and Trout are very sensitive to this product. However the packaging they ship the jug in is really crappy! Just an over sized flimsy box with no bubble wrap or paper and twice the 2.5 gallon jug has arrived with the box damaged & the seal on the jug broken and the chemical leaking thru the box. Not good!

GOOD STUFF ! Blocks Sunlight, inhibits bottom and other algae growth. Good Color. Not as Disney Land/World green as some dyes can be. This doesn't quite look natural, but best I have found. Natural would not dye water at all. We are in Houston, and heavy bright long sunny hot days demand using a dye in our One Acre lake. We are able to get about two treatments from one container. Without this dye our water would be crystal clear and the pond would turn over or blossom with algae growth. This prevents it.

Did not clear up the moss and algae the way i had hoped.

Used half a gallon of this product with 3 gallons of water. Algea was all around the perimeter of the pond but I only sprayed half of the perimeter and within 3-4 days the algea was gone. Great product. Easy to use and well worth the cost to see the unsightly algea gone.