Just my different opinion about cattails. They work for me since I don't fish my pond but observe it. The cattails growing out from the shore and thicken don't allow FA to grow. Run off into the pond is filtered. The dead leaves laying in the water provide bedding for ducks, birds, frogs and turtles lay on it and fish nibble on it and it provides structure for them. I did spray them in front of my deck using cheap Walmart Eliminator herbicide and dish washer surfactant and it flattened the Cattails in about 6 weeks.