I have a small pond, roughly 2 acres on my property that I purchased last yet. The previous owner let it go all of last year as it was taken over by what I believe is Filamentous algae.

There are mats of this over approximately 5% of the pond, the rest of this appears to be under the surface (about 50% of the pond, growing up from the bottom.

Neighors told be the previous owner used to treat it sucessfully with Cutrine (liquid). However, I see it comes in liquid and granular form.

I can see the liquied working on the floating mats, but would it have any effect of the alge below the surface? I was thinking the granular might be more effective?

Thanks, I appreciate your input.