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

I use it to kill the roots in my sewer line !!! Works great !!!

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.

Fast delivery

Third time purchasing this. Works great.

Buen producto

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.

This is a re-order, so obviously, I was satisfied.I used it to make Bordeaux (which cannot be purchased without a license anymore). After preparing stock solutions of lime and of this product, I strained and mixed the field-strength spray. A gel-like substance precipitated out and clogged my spray; I had to clean it a couple of times, then it was ok. Next time, I will decant the copper solution through the strainer. I don't know how that will work; some suggest that the precipitate forms from reaction with H2S in the water. Who knows. Still, I am very happy to use this product 30 days after oil to diminish disease on my grapes before budding out. (Please be careful in the use of this spray--I wear rubber boots, rainsuit with hood, respirator, full face shield, and gloves.)

I have to admit this is the most affective product I have ever used to combate mustard algee in our pool.Mixed a third of a cup in 2 gallons of water and slowly poured it into the water. Gave the pool a thorough brushing on all under water surfaces and ran the pool equipment for 8 hours, repeated the process 10 days later and no more algee.