Aquascape EcoBlast Contact Granular Algaecide – Fast-Acting Algae Remover for Waterfalls, Streams, and Rocks, Works at Any Temperature, 38.4 oz / 1.1 kg, 29312

This is the best product I have ever used to remove algae from the rocks in my koi pond. I have tried so many different products and none of them have taken care of the problem. This product is very easy to use and works fantastic. I can now see the rocks in the pond and the waterfall is completely clear of algae.

I received this today and immediately sprinkled it in the basin of our waterfall and within a couple hours it was very clear. I'm sure by morning it will look even better. I will be buying this again as it is so much easier to use than the liquid. I don’t have to worry about splashing, and it is fine with the birds and the lizards.

Didn't take off discoloration from rocks in our pond. Handled the moss pretty well though

Works well at eliminating algae

I have a large backyard koi pond that I built 16 years ago. I've tried a lot of algae products over the years. I was turned onto this one by a local pond shop. In the early Spring, I start getting a lot of string algae on my waterfall. It's a real pain to get it under control. With this, I simply shut down the waterfall, sprinkle some of this on the waterfall and let it sit while I clean the filter and pond. By the time I am done, the string algae on the waterfall is mostly dissolved. I turn the waterfall back on, the foamy residue goes into the pond (and treats the water for future algae), and a quick spray with the hose brings my waterfall back to its natural rock look. It's effortless algae removal at its best. ** Be aware that you follow the safety steps listed on the container ** I always have a container of this in my pond supplies. It works great and I've never had an issue using it with my plants or fish.

This did not work for us on a 1,000 gallon outdoor water fall. Even after putting two hug scoops in, there is still tons of Algae. The leading competitor we would use two small tablespoons and the algae would be gone.

I’ve used a product before that was granular and it worked beautifully. I figured since this was granular that it would work just as well! Boy, was I wrong! I have a water feature that is not that large and this product is not strong enough to clear everything up!

Kills the algae at least for a while after one application