Blue Lake and Pond Dye - One Gallon of Professional Lake & Pond Dye - Treats Up to 1 Acre - Royal Blue Color - Safe for Fish, Wildlife, Pets & Children

We've been using this in our ornamental pond/waterfall for a very long time now. I believe that the first gallon lasted over a years' time. It is very concentrated. And I do believe that it helps with reducing algae growth. Although it doesn't stop it. But with all of the bird poop that is washed into our pond every year, to feed the algae, I don't think there is anything that will completely stop it accept for chlorinating.

Great product. A gallon is just right to treat our 3/4 acre pond. Highly recommended.

Does the job as promised.

UPDATE: after posting the below review customer service reached out and offered to send me another thing of dye to try. It took more than anticipated, but it did get my pond to a very pretty color. I appreciate this company standing behind their product and helping me to troubleshoot. I’ll purchase again and just know that I need to dose heavy the very first time (but use less to maintain the color) We have previously used the AirMax dye, but wanted to try something else. This was not nearly as good. It took a lot to get a similar color and the color only lasted a short while even in cooler temps. Would not repurchase.

Just put in pond today, it’s a colorful dye all RIGHT and very bright. It reminds me of back in high school when I had an ink pin with one of the ink cartridges when they break and leak! lol so far I’m impressed. It’s already breaking up the algae on top of the water. Will update later on.

Tried this brand of blue dye for my pond compared to a previous brand. The cost of this product was around $30 US dollars vs over $50 of previous both 1 gallon each. For the $ I see the results about the same for less $. Therefore I can highly recommend this brand.

This product works extremely well. My pond has clear water and in summer it was hard to keep the grass and weeds down since I started coloring pond sunlight can't penetrate the water has easily the fish are a lot less spooked weeds and grass are little to none this year

My palm is so big I used six of them to color it beautiful