Hackectten packing, also known as Tti-Pac, is commonly used in air purification devices domestically, hence it is often referred to as filter balls or eco-friendly filter balls. It was developed in 1978 by R.A. Jaeger of Germany (now Jaeger Products Inc. in the United States). Hackectten packing consists of numerous branched grids forming a hollow spherical filler. This structure facilitates the wetting of the packing surface and the renewal of the liquid film. Due to the uniform porosity of the grids when stacked in the tower, it promotes the distribution of gas and liquid and reduces the resistance of airflow through the bed. It is particularly suitable for gas absorption, exhaust gas purification devices, and can operate under low liquid load conditions.