Dwight from Jonesboro Arkansas writes
There is no specific time frame mentioned on the product label for application of Crystal Blue Copper Sulfate. Since this product is labeled for and intended for use in ponds, sewers, septic tanks and impounded water to control most species of algae like filamentous or string algae, we would recommend contacting the manufacturer directly at (888) 697-2626 or via their website's contact page for questions not addressed on the product label.
Answer last updated on: 05/28/2021