Copper Sulfate Pentahydrate - 25.2% Cu - 1 Pound - Easy to Dissolve - Powder

I was 100% terrified to amend the copper levels in my pumpkin patch but it was way easier than I expected. This product was effective and it will last ages. Huge value for the price.

I've had toe nail fungus for 25 years and tried everything - prescription, over the counter and home remedy. Nothing worked. I used this product for 10 days a year ago and it totally killed the fungus, all gone. Toenails have now have grown out healthy and fungus free.

This copper sulfate worked exactly as expected. Very effective, easy to use, and delivers quick results. The quality is great and a little goes a long way. Definitely a reliable product — highly recommend!

Just fine

Love this stuff for the pool. Used on a regular basis it will keep algae away. It is replaces all that expensive bottles of algicide I use to buy. Big money saver and works great. It’s a win win!

I had read about the wonders of Copper as an anti-algae agent, did a little research and figured for the price I couldn’t fail. This stuff is amazing, I had zero algae bloom, didn’t even have issues near/under my stairs which are annually horrible. Reduced my Chlorine requirements.(probably by 20% or more, I didn’t want to mess up balances so I didn’t reduce it any more than 20%) The water “sparkled”(I keep a clean pool, this was epic). And the pound of product will likely last me 5 or more years.

I used this to treat for black mold behind baseboards. (Don't use it anywhere visible, because it turns everything blue.) It can be added to sprays (7%?) for fruit trees and garden plants to treat and prevent plant fungus. It also works to kill toenail fungus if you soak your toes daily for a few weeks to a few months. Unfortunately, it turns your toenails a bit blue green (unevenly), but that doesn't matter to me because I never wear sandals or flip flops. The blue green doesn't fade very fast, but it eventually grows out over several months after you stop the treatments. For women, nail polish would probably cover it just fine.

Easy to use and kills swimming pool algae very fast.