Here is the label.
http://plants.ifas.ufl.edu/guide/sonarq_label.pdf � Pounds of Sonar Q required per treated acre = Average water
depth of treatment site x Desired ppb concentration of active
ingredient equivalents x 0.054
For example, the pounds per acre of Sonar Q required to provide
a concentration of 25 ppb of active ingredient equivalents in water
with an average depth of 5 feet is calculated as follows:
5 x 25 x 0.054 = 6.75 pounds per treated surface acre.
From the max rate table 90ppb
4 x 90 x .054 = 19.44 per acre / your .25 acre pond = 4.86 lbs.
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