Thanks for the info on the concentration. How do you generally do the math to achieve at least a 90 PPB? I assume you use a weight per volume ratio specific to the chemical.
Barring really bad luck, I'm not too worried about keeping the PPB steady for 30 days. There is not a lot of flow through the pond as it lacks a spring or stream and the drain field is not big relative to pond size. Unless we get really whacked with several days of heavy rain the pond keeps a steady level.
