[AT] Sap is rising/good news and bad

[Len Rugen]

Isn't that also used in septic systems to stop roots? 

If so, it's not the light.....

Mark Greer wrote:
> It is my understanding that copper sulfate is used in ponds to prevent algae 
> and does so by coloring the water and depriving the algae of light. I don't 
> think it actually kills the algae from a toxic reaction to the copper 
> sulfate. You've probably noticed some farm ponds with blue water that is a 
> bit un-natural looking but very clean of weeds & algae. There are chemicals 
> that do kill aquatic weeds like Round-Up does on land. I think the aquatic 
> version of Round-Up is called Rodeo or something like that.
> Mark
>
>