Hi Cecil,
I'm struggling to keep dye in my pond too. (See pics in my Structural Algae post) I have about 7 acre feet, Added 1.5 gallons blue dye, looked good the next day or two (with aggressive aeration 24/7). Within one week, visually, I would estimate >60% loss, end of week 2, barely a trace is left. I do have spring flow (approx 20gpm) that would account for 201600 gals/wk or 8.8% of my 2.281,000 gallons. I have very alkaline water with limestone all around. Results don't seem to change between brands either. Being mid Wisconsin, nervous about fertilizing, as the chara seems ready and willing to consume.
