[Mike of the Mountain]

Originally Posted by Stan Hillis

Clear water that allows sunlight to reach the bottom is a necessity for filamentous algae to grow. Dark water or water muddied from heavy rain runoff will kill it temporarily, but when it clears up again it will regrow.

I have fought it in my three ponds/lakes for a lifetime. Herbicides help for a few months but will never totally get rid of it. My grandad believed in fertilizing his pond with a special granular pond fertilizer to make the water dark. It would get so black in a few days after a fertilization that a paddle would disappear from sight in less than 12 inches depth. All algae would die and the water would be free of it for a month or so. When the water cleared back up the algae would come back.

Stan, sad thing is it worked and if your grandpap did that now the environazis would lock him up.