Cooling tower fill also could been used in sewage treament, because of the large specific surface area, good oxygenation conditions in the tank and high biosolids per unit volume in the tank, the biological contact oxidation tank has a higher volume load. Due to the large amount of biological solids in the biological contact oxidation pool, the water is completely mixed, so it has a strong ability to adapt to the sudden change of water quality and quantity.

The Net fill (Non-glued assembly fill) have been specially designed for medium to strongly polluted cooling water, it focus of the development being on a high stability as well as on easy and economical installation. Therefore these fills are built from mechanically joint grids and are easily cleaned. The Net grid packings are high-performance fills which provide an optimized pressure drop.