It's not possible to determine the reach of the spray pattern for your particular application because there are too many unknown factors. If your water supply has low flow, meaning you have low water pressure or volume, then you may need the 1 GPM Minimum screen to produce a spray pattern that doesn't dribble. On the other hand, if your system has plenty of flow, the range of screens allows you to choose a spray pattern that will either reach a further distance (1 GPM screen) or deliver more volume (4 GPM screen).