You will need to adjust media flow from time to time, when you are using different types of media or when you are switching between wet and dry blasting.
Start with outlet pipe 1/2 inch above locked position, and adjust in 1/16 inch increments until media runs out before water. Coarser media will require a higher outlet pipe setting.
Start with outlet pipe 3/8 inch above locked position and adjust in 1/16 inch increments until you reach the desired productivity to use ratio. Setting will be closer to 1/8 inch for fine media and up to 3/4 inch for coarse media.