Originally Posted by RAH
Got to stay under 0.3 ppm. https://aquaplant.tamu.edu/files/2018/08/Hydrothol-191-Label.pdf

I'm not even gonna check that. If you posted it, I know it's correct. So, be extra careful with Alkylamine Salts of Endothall, and do your math. It's the only herbicide/algaecide that caused me problems. I would also consider going with liquids if possible. The fish I lost were in the granular fall zone, and no fish were killed adjacent to that. If I could have seen those fish, I would have gone a different route.

AL