Okay, so today we are going to knock out the algae in my pond. The water in my pond is low and the algae is taking over. I look out the window and it looks like I am Shrek and this is my swamp. I used a rake to get out what i could reach around the house. For the rest of the pond, I used Copper Sulfate. You can find this at any Tractor Supply or just order it online. I also bought the pond dye at Tractor Supply. The dye did not last long due to the rain and leak in my dam.