PVC fills The water is cooled as it slides through the fill by gravity while in immediate contact with air that disregards it. The cooled water is then gathered in a frosty water bowl beneath the fill from which it is pumped again through the procedure to assimilate more high temperature. The warmed and dampness laden air leaving the fill is released to the climate at a point remote enough from the air bays to keep its consistently stepped go into the cooling tower.