To achieve small changes in GPM rate, which should you adjust?

To achieve small changes in gallons per minute (GPM) rate, adjusting the pressure regulator is the most effective method. Pressure regulators control the pressure of the fluid being delivered through the system. By fine-tuning the pressure, you can make precise adjustments to the flow rate, which directly impacts the GPM.

When the pressure is increased, the flow rate typically increases, and conversely, reducing the pressure will decrease the flow rate. This is particularly useful in applications where accurate dosing or specific flow rates are crucial, such as in aquatic pest management for applying herbicides or pesticides.

Other options may impact flow rate as well, but they do not offer the same level of precision in controlling small changes. Nozzles are important for determining the pattern and distribution of the spray, but they are designed to deliver a specific flow rate based on pressure and are not easily adjustable for small increments. Changing the tank size affects the overall volume of capacity but does not directly control flow rate adjustments. A flow meter measures the GPM but does not provide a mechanism for controlling or adjusting the flow rate itself.