In The Swim Black Algaecide – Eradicates Black Algae in Swimming Pools - Copper Sulfate Pentahydrate - 1 Quart F050001012AE

My swimming pool had turned into a cesspool having neglected it for 3 months due to illness. I had only had black algae once before in thirty years. It is coming back to life!!!

I was skeptical because many black algae products did not work but this one cleaned the spots off quickly'

This product finally solved my black algae problem in my pool

It restored our pool to crystal clear water.

Works great!

It does exactly as it says. Make sure to balance first.

The product should have been secured in a plastic bag for leakage. The product delivered was leaking. The carrier transferred the leaking container into a ziploc bag and shipped it to me. with a wet box

It did not remove the black algae. It lighted it. It went from black to brownish. But, now it looks like it is getting worse. This was an expensive product for the results. I am very disappointed.

My pool is crystal clear but not because of this product. It was already clear but there are 4 spots of black algae, the whole reason i bought this product. The spots are the same after using the product.

I super chlorinated the pool, added the complete bottle...after a week still ZERO results. I might as well thrown $25 in the pool. The paper might have soaked up something. Blue worthless.