I'm not from your neck of the woods, but we have our share of filamentous (i always have a hard time spelling the stuff) algae here in SW Louisiana. Sounds like you need to learn from a local pro about fertilizing instead of using cutrine to control your algae. Cutrine will not only kill your filamentous algae, but all other plants including phytoplankton, and the product is copper based and will have a buildup in your pond with continued use. Get some advise from a local freshwater fisheries biologist, I always start with the state variety and go to the private ones when I can't make up my mind after talking to the ones with free advice!?
