Please help me determine how much Copper Sulfate pentahydrate powder to add to water

[Winstonsmith314]

Originally Posted by Ray

Copper sulfate pentahydrate is 25.4% Cu.

Phyton 27 is 5.5% Cu.

That suggests that you to get an equivalent elemental copper dosage, you should choose the recommended Phyton 27 concentration and mix 55/25.4=0.2165 of that amount of copper sulfate.

If that’s 2-3 tsp/gal, then you’d be OK with 0.43-0.65 tsp/gal.

Thank you, that's exactly what I needed.