Deb, you did say under another thread to post on fert. one, Not sure of visibility but is blue it is usually around 20 inches or so Zsd. TJust because you can see a disc at more than 24 inches however does not mean the dye is not slowing down phytoplnkton produciton.
Yep it sounds like Claude was mistaken so glad to hear we do agree at least on what is best for cattail control
Not sure of visibility but is blue it is usually around 20 inches or so Zsd. TJust because you can see a disc at more than 24 inches however does not mean the dye is not slowing down phytoplnkton produciton. 
