I have an above ground pool, Hayward 18” sand filter (S180T), and Hayward gas heater (H100ID). The heater inlet is on the side of heater, 14" from the ground. I'm replacing the 1 1/2" flexible pvc hose from filter to heater with a standard 1 1/2" hose. Does hose have to be long enough so part of it lays on the ground, or can it go from filter to heater without touching the ground?