Aquascape EcoBlast Contact Granular Algaecide – Fast-Acting Algae Remover for Waterfalls, Streams, and Rocks, Works at Any Temperature, 8.8 oz / 250 g, 29311

It will kill string algae but it is not a long term solution. A balanced pond with plants and fish generally works well.

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.

The algaecide powder is easy to measure using the enclosed scoop.The instructions offer complete details about the proper usage of algaecide.It's important to know the amount of water in your pond to estimate the amount of algaecide to use. It works quickly and causes no after-effects in the water.

My algae increased after using this. Related or would it have been much worse if I didn’t use? It was over 100°-up to 107° here locally during that time.

This ecoblast really works in my koi pond and I wish I could give them 5 stars but it is almost impossible to get the lid off. After spending more than 30 minutes and cutting my hand trying to open the product I was not a happy camper.

I have a pondless waterfall, so just rocks with a waterfall. The rocks always get green where it gets wet, it gets a lot of sun. Using this stuff got rid of all the algae on the rocks!

REVISED and UPDATED: Ater I had used the hand vaccuum to clean up what was on the rug, my husband read the warnings on the label. It said do not inhale--too late for me. I had to take off all my clothes because I had the granuales and powder on my shoes, my jeans and my shirt. I also had to remove the table cloth and place mats from our kitchen table. I have some burning in my mouth right now. My husband said his nose is buring. If this doesn't subside soon, I will have to go to urgent care. Someone needs to check and ensure that this product is safely packaged!The mailing package had quite a bit of loose product in it. The lid was off. I had to poor product from the package into the jar. I had product on the floor, on my jeans and on my hands. It would have been better if the lids had been checked to ensure they were fastened securely, taped down or placed in sealed bags. I am thankful that our cats did not get into this.

Works great and doesn't kill my water lillys