Here's what I learned from the Applied Biochemist tech support person - very helpful.
Cutrine Plus Application Rates

Rate for Filamentous Algae (Pond Scum), is 6/10 Gallon Cutrine per Acre-Foot of water treated.

Example:

Say you have 2-3 Ft.wide mats around entire 2-Acre pond, or approx. 10% of pond, or .2 Acres

Average depth of area to be treated = 2 ft.

2 Acres X 10% X 2 ft average depth = . 2 Acres X 2 = .4 Acre-feet to treat.

.4 Acre-Feet x .6 Gallons Cutrine recomm. Rate / Acre Foot = .24 Gallons

128 oz.(Gal) X .24 = 31 oz. Approx. 1 Quart For entire area around pond.

Put 1 Qt. In Sprayer, Add 3 Gallons Water. Spray entire area.

That's a lot less Cutrine than I've used in the past, so I'll report back and let everyone know what results I have.
Dave