Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants Sonar and water flow.

IMO the Sonar conc will decrease to levels way below what was originally applied. You will likely have to retreat with at least 50%70% of what was originally applied. A heavy inflow & outflow of water can create a significant dilution of the chemical. About 30% to 60%+ of a pond's water is in the top 3ft. Percentage is dependent on the average depth.