Poppy, dont overreact. After reading several labels by diff manufacturers, it is apparent that, as usual, if it is manufactured by companies with deep pockets that can get it labeled for aquatic use, then they do. It will dissipate given a little time. Microbes, which are present in all pond water, help break it down. If you are aerating, apparently it will break down faster.
From my readings: not toxic to fish at recommended levels, but highly toxic to aquatic invertebrates. Is used in Miss. catfish farm ponds to combat blue-green algae outbreaks, which cause off-flavor in their fish. They get EPA exemptions to use it if they are subject to contamination my the Miss. River. Usage rate is 0.5 oz. of product(0.4 oz. active ingredient) per acre ft. Same ingredient as Karmex.
I have never read anything that specifically states that it can legally be used in ponds with fish. There are much better choices that are safer and will kill only the algae. If you drain your pond, then you may and probably will contaminate/kill vegetation downstream.
Last edited by burgermeister; 06/17/10 12:00 PM.
