S wave cooling tower fills has trapezoidal "s" wave design, which increases the closure number of water film, and make the water film redistribute repeatedly as well as tending to be more uniform. It extends the time for heat and mass transfer and improves the cooling effect. Several pieces of fills are connected which each other, forming honeycomb passages, which prevents contaminants from blocking. It is widely used in circular counterflow cooling towers, square counterflow cooling towers.