Diuron 80DF really should not be used in water. It's worse than nonaquatic glysophate. You know you have a problem when the MSDS #12. directly states: Do not apply directly to water. Do not. I hate to say this, but it is against Federal Law to use this in water. I guess them catfish farmers have to get a commericial waiver. I do know the blue green ruins the flavor of the meat. I don't use this product at all. Too many rules and regs, toxic as all hell, 80% active ingrediant. You are supposed to be trained just to deal with it, rubber gloves and full clothing, no exposed skin to use it. No thanks. Nasty, nasty product.