This product was provided in exchange for an honest review. I received this in a very timely manner, nicely packaged to prevent leakage and damage. This algaecide treats green, mustard, blue and black algae. It contains copper which when not used properly can turn blonde hair green and/or damage components of your pool. These are common issues for misuse of any pool chemical. To use this product you will need to balance other pool chemicals and then treat for the algae issue. If you are struggling to algae under control, this will be a good product to use. As it treats multiple strains of algae, you won't have to keep trying products to get things under control. I ordered this in anticipation of an excess of algae in my pool prior to the opening this spring. My cover was destroyed after our first huge snowfall so the spring buds from a close by tree will make it necessary for me to implement chemicals that treat a wide variety of issues. I've had problems with these types of issues before and paid a pool supply store a lot for the recommended treatments. This is affordable and less costly than the same product from other suppliers. And, still other available algaecides are only 7% active ingredients while this one is 10% active ingredients. I want to make sure I keep algae under control and I am anticipating the need for more powerful chemicals to help me get my pool opened and under control as quickly as possible. This is a liquid so dissolving it is not an issue, but it is vital to have the proper circulation for effectiveness. I gave 4 stars on ease of use because you must follow instructions carefully or you can cause harm to self or pool components.