How to get rid of watermeal in a pond is a common question with a simple answer. Watermeal control can be obtained two ways.
Manual/ Mechanical Control:
Physically raking watermeal from the water’s surface can be an effective method of control.
Semera or Flumigard (paired with a surfactant) will give excellent watermeal control. Semera and Flumigard come in granules or liquid, depending on the size of the package. Either should be diluted with water and paired with a surfactant then sprayed directly onto the watermeal.