You know of all the products I have dealt with, the pond dyes are about the loosest labeling I have seen. It's hard to get any info, even data sheets or MSDS. In order to get organic labeling you have to go through a certification process. I don't think a lot of manufacturers care enough to deal with that. I know some algaecides are toxic to birds, and other critters. But this dye stuff is pretty much just a colorant. Not a cide. It is not meant to kill anything. It also says right on the label, nontoxic to fish. Something to shade the sun and prevent algae is better than nothing. Besides, I'd much rather go this route organic or not than use copper killer and sink the algae to feed another bloom. Today Italian marble fountain maintenance at a winery. I have aquatic gardens in there. But can't use dye there and risk staining.
