Aquashade Blue Pond Dye - 1 Gallon EPA-Approved Sunlight Blocker for Algae - Weed Suppression - Safe for Fish, Livestock and Swimming - Eco-Friendly Liquid Treatment for Water

This is the only product of its type that works. It's best to put it in early spring. Then when you start to see algae growth. Once algae stops growing, a heavy rain will sink the dead algae mats.

I have used cheaper brands that are not as good. Never been disappointed with this brand. Great lasting color.

Pricey but seems to be the best color and lasts the longest. I've tried the cheaper pond dye but came back to Aquashade

This stuff is pricey but it works very well. It keep the water crystal clear as long as you keep treating. Our pond is 0.6 acre with 4 acre feet of water. I add one gallon every 3 months even in winter. Sometimes heavy spring rains requires an additional gallon.

1/2 gallon in my pond did the trick. Turned from a brown color to a nice aquarium in one day

We hand dug a pond approximately 1/2 acre in size, with an island in the middle, a bridge leading to the island, and a swimming dock. Our pond is about 12' deep at its deepest point. We have struggled with algae, cattails, azolla, some surface weeds, and a filamentous weed. Our best control was Muscrat Sam, whose sole purpose in life was to eat my foliage, good and bad. Unfortunately, he burrows into the perimeter and the island, destroying my shoreline. He had to be fired. I tried this Aquashade when the weeds were fully established. It took about a third of a gallon and an hour to turn my entire pond into a stunning teal color, and since then, my weeds have not died but they have not grown. They suggest pouring it on the ice in the spring, and that might provide for total weed control. I haven't lost my Canadian Goose family, my fish are all surviving, and even the bullfrogs and crayfish stick around. I would buy this product just for the colorant alone, but be prepared that a little goes a loooooong way.Update 6/27/19: We applied this first to the ice before the pond melted in the spring. We won't be doing it again because our pond has an overflow...which took most of the Aqua Shade with it. We bought another gallon, used less than half, and we have little to no weed growth...just a few stubborn pickerel weeds by the shore in the shallows. I don't mind those, though, and do not plan on eradicating them. The picture is three weeks after application. You can see the geese on the right, the deer in the back, but you can't hear the bullfrogs, and the turkeys are just to the left. I am now a steady customer.

great stuffUse sparingly! Lol

Trying nearly all the Pond Colorants out there, we like Aqua Shade the best. It stays during all seasons if you use enough, lovely ice frost blue color in cold weather. It seems to do a better job at the price than other brands, quieting the algae growth spurred on by the sun. Put it in as soon as Spring warmth hits. Does not harm fish, cats dogs, horses drinking from source, nor does it bother pond fish - not sure about Koi fish though. Pour freely - I take a plastic cup & throw smaller amounts into water in various spots w/wind will left to stir it around. Use a set of rubber gloves as this product gives you "Blue Man" hands only Clorox will wash out. I use about 3- 4 gallons a year in a .275 (just over 1/4 acre) pond. Good stuff!