This is a perfect example of why you should identify your pond growth before treating!
From a distance, the photo above looks like algae, but in reality it is a floating weed called Watermeal. While algae will need an algaecide such as Crystal Plex or Copper Sulfate, Watermeal needs a diquat herbicide such as Tsunami.
Need help identifying your growth? Utilize our Pond ID on our website or email detailed photos to our office to info@sancoindustries.net.