I have a 3666 gph Flotec sump pump, I use a timer that can spray for 5 seconds on/ 20 minutes off. in the 5 seconds my sprayers are on about 3 gallons is pumped out.. all 1-1/4" PVC and pvc turn valves(home depot) to adjust the pressure to each box. two methods I use, but get the right timer, its worth it if your spraying roots($75-$100)