If you use Cutrine Plus to knock back any FA, that will free up more nutrients for phytoplankton and for the Pondweed. It'll be a race to see who gets it (the nutrients) first.

My pond can go from 24" to 60+" of visibility depending on the amount of plants/FA in the pond utilizing the nutrients.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).