I believe you can lengthen your hose with no problems. To be safe I would check how much volume you get per minute and check the pressure before and, then check after the change. As always calibrate and make any adjustments needed to apply per the label. I have a spot sprayer for Gly that is in the pick up. I use for parking lots. I have about 75 foot of hose on there and have had as much as 125 feet and had no problems. But as you know Gly is for total kill.